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-113=7+8a
We move all terms to the left:
-113-(7+8a)=0
We add all the numbers together, and all the variables
-(8a+7)-113=0
We get rid of parentheses
-8a-7-113=0
We add all the numbers together, and all the variables
-8a-120=0
We move all terms containing a to the left, all other terms to the right
-8a=120
a=120/-8
a=-15
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