-15=b+4b

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Solution for -15=b+4b equation: 



-15=b+4b

We move all terms to the left:

-15-(b+4b)=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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