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-(3a+3)=-3*3a
We move all terms to the left:
-(3a+3)-(-3*3a)=0
We get rid of parentheses
-3a+3*3a-3=0
Wy multiply elements
-3a+9a-3=0
We add all the numbers together, and all the variables
6a-3=0
We move all terms containing a to the left, all other terms to the right
6a=3
a=3/6
a=1/2
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