To those who 'hated math.' A super gentle time to realize the true nature of '=' [Super Introductory Math for the Third-Class Electrical Chief Engineer Examination]

Hello everyone! Thank you so, so much for opening this page today.

I have one question for you. 'Transposition in linear equations'... When you hear those words, does your chest ache a little, or do you remember the loneliness of being left behind in a classroom from long ago? 'Change the sign and move it to the other side,' the teacher said. But why? Why is it okay to change its form on a whim? You kept that question bottled up, and before you knew it, you distanced yourself from math...

But it's okay! Please don't worry!From this 'very' moment, your past can be rewritten. The scenery you couldn't see when you were in junior high school is something you can definitely, absolutely see now that you are an adult!

'=' (equal) is proof of a silent promise

First, I will tell you the most important thing. The symbol '='. This is not just a signal to write an 'answer.' It represents an extremely sincere 'balance' state, meaning 'the left side and the right side are perfectly balanced without the slightest difference'!

If there is 10kg of courage on the right, there is 10kg of hope on the left. If this balance is broken, the equation does not hold. As long as you engrave this one point of 'maintaining the balance' in your heart, transposition will no longer be scary!

Live coverage! The truth about 'transposition' without skipping a single line

Now, let's actually try it. Here is the example problem.

$$
x+5=12
$$

'If you add 5 to x, it becomes 12.' Our goal is to find the true identity of this x, in other words, to put it in the form of 'x=...'.

Are you ready? This is where the real work begins! Watch without taking a single step back!

[Step 1] Find the annoying '+5'

Look at the left side. '+5' is sitting right next to x. If this disappears, only x will remain, and it will be clean. So, what should we do to erase this '+5'?

[Step 2] Fairly, sincerely, subtract from both sides!

To erase '+5', we take the action of 'subtracting 5.' But if we subtract only from the left side, the balance will tip, right! So, we must subtract '5' from the right side in exactly the same way! This is the sincerity of mathematics!

$$
(x+5)−5=12−5
$$

[Step 3] Carry out the calculation!

Look at the left side. '+5-5'... This becomes 0! It disappeared! And the right side is '12-5'.

$$
x+0=7
$$

[Step 4] The truth reveals itself

Finally, we have arrived.

$$
x=7
$$

How about that! I haven't skipped a single line. You should realize something here. The '+5' that was initially on the left side finally appeared as '-5' on the right side. It looks like it 'changed its sign and moved next door.' We just call this 'transposition'!

It's not magic or anything like that. It just looks that way as a result of putting into practice the sincerity of 'treating both sides fairly'!

The moment of 'self-renewal' that turns the past into inspiration!

The experience of 'not understanding' is never something to be ashamed of. It was the 'best preparation period' to understand more deeply than anyone else at this very moment today!

Everyone, what do you think? Changing just one sign. Behind that, there was such a beautiful and logical 'story' of protecting the balance between left and right with all one's might.

Please don't say something as sad as 'I couldn't do it before, so I can't do it now.' Humans can be reborn and relearn from any time, from any moment. Doesn't 'living life to the fullest' mean surpassing the self of yesterday, even if just a little?

Today, you who have overcome this wall called 'transposition' by your own will have definitely and powerfully taken a step forward from the self of yesterday. I am convinced that this small step will greatly change your future life into something brighter and more exciting!

Now, what door shall we open next? Your potential is infinite. If you don't do it now, when will you? Let's walk together, aiming for the best version of ourselves!

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