87=9b+15

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Solution for 87=9b+15 equation: 



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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