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-112=2a-8
We move all terms to the left:
-112-(2a-8)=0
We get rid of parentheses
-2a+8-112=0
We add all the numbers together, and all the variables
-2a-104=0
We move all terms containing a to the left, all other terms to the right
-2a=104
a=104/-2
a=-52
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