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6y+15=3y-12
We move all terms to the left:
6y+15-(3y-12)=0
We get rid of parentheses
6y-3y+12+15=0
We add all the numbers together, and all the variables
3y+27=0
We move all terms containing y to the left, all other terms to the right
3y=-27
y=-27/3
y=-9
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