-3(-2a+7)=9

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Solution for -3(-2a+7)=9 equation: 



-3(-2a+7)=9

We move all terms to the left:

-3(-2a+7)-(9)=0

We multiply parentheses

6a-21-9=0

We add all the numbers together, and all the variables

6a-30=0

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

6a=30

a=30/6

a=5

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