-7b=21.

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Solution for -7b=21. equation: 



-7b=21.

We move all terms to the left:

-7b-(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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