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-6(-a-7)=3(a+5)
We move all terms to the left:
-6(-a-7)-(3(a+5))=0
We add all the numbers together, and all the variables
-6(-1a-7)-(3(a+5))=0
We multiply parentheses
6a-(3(a+5))+42=0
We calculate terms in parentheses: -(3(a+5)), so:We get rid of parentheses
3(a+5)
We multiply parentheses
3a+15
Back to the equation:
-(3a+15)
6a-3a-15+42=0
We add all the numbers together, and all the variables
3a+27=0
We move all terms containing a to the left, all other terms to the right
3a=-27
a=-27/3
a=-9
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