3b+2-7b=21

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Solution for 3b+2-7b=21 equation: 



3b+2-7b=21

We move all terms to the left:

3b+2-7b-(21)=0

We add all the numbers together, and all the variables

-4b-19=0

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

-4b=19

b=19/-4

b=-4+3/4

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