15=3b-8b

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Solution for 15=3b-8b equation: 



15=3b-8b

We move all terms to the left:

15-(3b-8b)=0

We add all the numbers together, and all the variables

-(-5b)+15=0

We get rid of parentheses

5b+15=0

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

5b=-15

b=-15/5

b=-3

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