b-15=5b-87

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Solution for b-15=5b-87 equation: 



b-15=5b-87

We move all terms to the left:

b-15-(5b-87)=0

We get rid of parentheses

b-5b+87-15=0

We add all the numbers together, and all the variables

-4b+72=0

We move all terms containing b to the left, all other terms to the right

-4b=-72

b=-72/-4

b=+18

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