X-3=y,y=12

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Solution for X-3=y,y=12 equation: 



X-3=X.X=12

We move all terms to the left:

X-3-(X.X)=0

We add all the numbers together, and all the variables

X-(+X.X)-3=0

We get rid of parentheses

X-X.X-3=0

We move all terms containing X to the left, all other terms to the right

X-X.X=3

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