3a-3(3a+3)=15

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Solution for 3a-3(3a+3)=15 equation: 



3a-3(3a+3)=15

We move all terms to the left:

3a-3(3a+3)-(15)=0

We multiply parentheses

3a-9a-9-15=0

We add all the numbers together, and all the variables

-6a-24=0

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

-6a=24

a=24/-6

a=-4

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