15=7+8b

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Solution for 15=7+8b equation: 



15=7+8b

We move all terms to the left:

15-(7+8b)=0

We add all the numbers together, and all the variables

-(8b+7)+15=0

We get rid of parentheses

-8b-7+15=0

We add all the numbers together, and all the variables

-8b+8=0

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

-8b=-8

b=-8/-8

b=1

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