-3b+7b=-20.5

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Solution for -3b+7b=-20.5 equation: 



-3b+7b=-20.5

We move all terms to the left:

-3b+7b-(-20.5)=0

We add all the numbers together, and all the variables

4b+20.5=0

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

4b=-20.5

b=-20.5/4

b=-5+0.5/4

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