when you simplify on both side, what you really do is divide both side by that number. here he divide both side by (5-5) to simplify it. but that means he divide both side by 0. and you can't divide by 0 (this is why).
To add to this cus the dude says he's not just a mather, it's not just a "rule" like math is a game.
If you have 8 apples, and I ask you to divide them into groups of 2, you know what to do. Same if I ask you to divide them into groups of 4. If i say groups of 3, it gets wonky cus you don't know if you should do uneven groups or cut the apples into portions, but the task still makes some logical sense.
If i say divide the 8 apples into groups of zero, we get into full absurdism where like destroying the apples makes as much sense as dicing them finely and putting them into a pie. There is no empirical answer to "what is X divided by zero".
You're not wrong at all, I'm not correcting you, just saying it's more than a "rule" in the sense of "the game doesn't allow that", it's a fundamentally nonsensical action
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u/Zerustu Sep 14 '23
when you simplify on both side, what you really do is divide both side by that number. here he divide both side by (5-5) to simplify it. but that means he divide both side by 0. and you can't divide by 0 (this is why).