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-(4=3a)=9(3-a)
We move all terms to the left:
-(4-(3a))=0
We add all the numbers together, and all the variables
-(-3a+4)=0
We get rid of parentheses
3a-4=0
We move all terms containing a to the left, all other terms to the right
3a=4
a=4/3
a=1+1/3
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