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-(6y+12)=18
We move all terms to the left:
-(6y+12)-(18)=0
We get rid of parentheses
-6y-12-18=0
We add all the numbers together, and all the variables
-6y-30=0
We move all terms containing y to the left, all other terms to the right
-6y=30
y=30/-6
y=-5
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