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90=6(c+7)
We move all terms to the left:
90-(6(c+7))=0
We calculate terms in parentheses: -(6(c+7)), so:We get rid of parentheses
6(c+7)
We multiply parentheses
6c+42
Back to the equation:
-(6c+42)
-6c-42+90=0
We add all the numbers together, and all the variables
-6c+48=0
We move all terms containing c to the left, all other terms to the right
-6c=-48
c=-48/-6
c=+8
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