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87=2y+3
We move all terms to the left:
87-(2y+3)=0
We get rid of parentheses
-2y-3+87=0
We add all the numbers together, and all the variables
-2y+84=0
We move all terms containing y to the left, all other terms to the right
-2y=-84
y=-84/-2
y=+42
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