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We can say that x - y = 0

We can also say that 2x - 2y = x - y = 0

Divide by x-y and we end up with the following:

2 = 1 = 0

If you don't get how I explained it, Let me break it down for you.

[Say x = y]

X and Y are variables. They can be ANY number, so long as the two are equal in value. (Like 1337, for example.)

[We can say that x - y = 0]

Duh. Any number subtracted by itself no longer has a value. (1337 - 1337 = 0)

[We can also say that 2x - 2y = x - y = 0]

Multiply both variables by 2. Or 3. Or any number >9000 if you want. It'll be the same number. (2*1337 - 2*1337 = 1337 - 1337 = 0)

[Divide by x-y and we end up with the following: 2 = 1 = 0]

Take the variables out. Leave everything else in. If you multiplied the variable by 2, leave the 2s behind. If you didn't multiply the variable by anything, leave a 1 behind, because Any number divided by itself is 1.

And I was taught counting was important.