3(3a-3)=9

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Solution for 3(3a-3)=9 equation: 



3(3a-3)=9

We move all terms to the left:

3(3a-3)-(9)=0

We multiply parentheses

9a-9-9=0

We add all the numbers together, and all the variables

9a-18=0

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

9a=18

a=18/9

a=2

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