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12=4(a+3)
We move all terms to the left:
12-(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)
-4a-12+12=0
We add all the numbers together, and all the variables
-4a=0
a=0/-4
a=0
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