7(b-4)=21

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Solution for 7(b-4)=21 equation: 



7(b-4)=21

We move all terms to the left:

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

We multiply parentheses

7b-28-21=0

We add all the numbers together, and all the variables

7b-49=0

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

7b=49

b=49/7

b=7

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