12+3y=X

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Solution for 12+3y=X equation: 



12+3y=y

We move all terms to the left:

12+3y-(y)=0

We add all the numbers together, and all the variables

2y+12=0

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

2y=-12

y=-12/2

y=-6

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