X-12=-3y

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Solution for X-12=-3y equation: 



X-12=-3X

We move all terms to the left:

X-12-(-3X)=0

We get rid of parentheses

X+3X-12=0

We add all the numbers together, and all the variables

4X-12=0

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

4X=12

X=12/4

X=3

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