7(a-9)=21

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Solution for 7(a-9)=21 equation: 



7(a-9)=21

We move all terms to the left:

7(a-9)-(21)=0

We multiply parentheses

7a-63-21=0

We add all the numbers together, and all the variables

7a-84=0

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

7a=84

a=84/7

a=12

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