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8c-42=13(6-9c)
We move all terms to the left:
8c-42-(13(6-9c))=0
We add all the numbers together, and all the variables
8c-(13(-9c+6))-42=0
We calculate terms in parentheses: -(13(-9c+6)), so:We get rid of parentheses
13(-9c+6)
We multiply parentheses
-117c+78
Back to the equation:
-(-117c+78)
8c+117c-78-42=0
We add all the numbers together, and all the variables
125c-120=0
We move all terms containing c to the left, all other terms to the right
125c=120
c=120/125
c=24/25
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