b-4b=21

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Solution for b-4b=21 equation: 



b-4b=21

We move all terms to the left:

b-4b-(21)=0

We add all the numbers together, and all the variables

-3b-21=0

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

-3b=21

b=21/-3

b=-7

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