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5(a+3)=-(a+3)
We move all terms to the left:
5(a+3)-(-(a+3))=0
We multiply parentheses
5a-(-(a+3))+15=0
We calculate terms in parentheses: -(-(a+3)), so:We get rid of parentheses
-(a+3)
We get rid of parentheses
-a-3
We add all the numbers together, and all the variables
-1a-3
Back to the equation:
-(-1a-3)
5a+1a+3+15=0
We add all the numbers together, and all the variables
6a+18=0
We move all terms containing a to the left, all other terms to the right
6a=-18
a=-18/6
a=-3
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