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-129=8(c-6)+7
We move all terms to the left:
-129-(8(c-6)+7)=0
We calculate terms in parentheses: -(8(c-6)+7), so:We get rid of parentheses
8(c-6)+7
We multiply parentheses
8c-48+7
We add all the numbers together, and all the variables
8c-41
Back to the equation:
-(8c-41)
-8c+41-129=0
We add all the numbers together, and all the variables
-8c-88=0
We move all terms containing c to the left, all other terms to the right
-8c=88
c=88/-8
c=-11
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