-39=10b+3b

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Solution for -39=10b+3b equation: 



-39=10b+3b

We move all terms to the left:

-39-(10b+3b)=0

We add all the numbers together, and all the variables

-(+13b)-39=0

We get rid of parentheses

-13b-39=0

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

-13b=39

b=39/-13

b=-3

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