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87=4v+15
We move all terms to the left:
87-(4v+15)=0
We get rid of parentheses
-4v-15+87=0
We add all the numbers together, and all the variables
-4v+72=0
We move all terms containing v to the left, all other terms to the right
-4v=-72
v=-72/-4
v=+18
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