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9a-3=4(a+3)
We move all terms to the left:
9a-3-(4(a+3))=0
We calculate terms in parentheses: -(4(a+3)), so:We get rid of parentheses
4(a+3)
We multiply parentheses
4a+12
Back to the equation:
-(4a+12)
9a-4a-12-3=0
We add all the numbers together, and all the variables
5a-15=0
We move all terms containing a to the left, all other terms to the right
5a=15
a=15/5
a=3
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