7(2b-3)=21

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Solution for 7(2b-3)=21 equation: 



7(2b-3)=21

We move all terms to the left:

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

We multiply parentheses

14b-21-21=0

We add all the numbers together, and all the variables

14b-42=0

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

14b=42

b=42/14

b=3

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