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-(a+5)=-+7a
We move all terms to the left:
-(a+5)-(-+7a)=0
We add all the numbers together, and all the variables
-(a+5)-(+7a)=0
We get rid of parentheses
-a-7a-5=0
We add all the numbers together, and all the variables
-8a-5=0
We move all terms containing a to the left, all other terms to the right
-8a=5
a=5/-8
a=-5/8
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