-3b-4b=-21

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Solution for -3b-4b=-21 equation: 



-3b-4b=-21

We move all terms to the left:

-3b-4b-(-21)=0

We add all the numbers together, and all the variables

-7b+21=0

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

-7b=-21

b=-21/-7

b=+3

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