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3y=-12-y=
We move all terms to the left:
3y-(-12-y)=0
We add all the numbers together, and all the variables
3y-(-1y-12)=0
We get rid of parentheses
3y+1y+12=0
We add all the numbers together, and all the variables
4y+12=0
We move all terms containing y to the left, all other terms to the right
4y=-12
y=-12/4
y=-3
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