b+7=15+3b

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Solution for b+7=15+3b equation: 



b+7=15+3b

We move all terms to the left:

b+7-(15+3b)=0

We add all the numbers together, and all the variables

b-(3b+15)+7=0

We get rid of parentheses

b-3b-15+7=0

We add all the numbers together, and all the variables

-2b-8=0

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

-2b=8

b=8/-2

b=-4

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