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(15+y+6+2y=0)
We move all terms to the left:
(15+y+6+2y-(0))=0
We add all the numbers together, and all the variables
(3y+21)=0
We get rid of parentheses
3y+21=0
We move all terms containing y to the left, all other terms to the right
3y=-21
y=-21/3
y=-7
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