21=4b+3b

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Solution for 21=4b+3b equation: 



21=4b+3b

We move all terms to the left:

21-(4b+3b)=0

We add all the numbers together, and all the variables

-(+7b)+21=0

We get rid of parentheses

-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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