7(2a-3)=21

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



7(2a-3)=21

We move all terms to the left:

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

We multiply parentheses

14a-21-21=0

We add all the numbers together, and all the variables

14a-42=0

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

14a=42

a=42/14

a=3

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