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87=9b+15
We move all terms to the left:
87-(9b+15)=0
We get rid of parentheses
-9b-15+87=0
We add all the numbers together, and all the variables
-9b+72=0
We move all terms containing b to the left, all other terms to the right
-9b=-72
b=-72/-9
b=+8
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