-2(b+39)=30

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Solution for -2(b+39)=30 equation: 



-2(b+39)=30

We move all terms to the left:

-2(b+39)-(30)=0

We multiply parentheses

-2b-78-30=0

We add all the numbers together, and all the variables

-2b-108=0

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

-2b=108

b=108/-2

b=-54

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