-3b+31=2b-9

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Solution for -3b+31=2b-9 equation: 



-3b+31=2b-9

We move all terms to the left:

-3b+31-(2b-9)=0

We get rid of parentheses

-3b-2b+9+31=0

We add all the numbers together, and all the variables

-5b+40=0

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

-5b=-40

b=-40/-5

b=+8

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