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(12y+3)=87
We move all terms to the left:
(12y+3)-(87)=0
We get rid of parentheses
12y+3-87=0
We add all the numbers together, and all the variables
12y-84=0
We move all terms containing y to the left, all other terms to the right
12y=84
y=84/12
y=7
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