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-104=2(4+8a)
We move all terms to the left:
-104-(2(4+8a))=0
We add all the numbers together, and all the variables
-(2(8a+4))-104=0
We calculate terms in parentheses: -(2(8a+4)), so:We get rid of parentheses
2(8a+4)
We multiply parentheses
16a+8
Back to the equation:
-(16a+8)
-16a-8-104=0
We add all the numbers together, and all the variables
-16a-112=0
We move all terms containing a to the left, all other terms to the right
-16a=112
a=112/-16
a=-7
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