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20=5(c-91)
We move all terms to the left:
20-(5(c-91))=0
We calculate terms in parentheses: -(5(c-91)), so:We get rid of parentheses
5(c-91)
We multiply parentheses
5c-455
Back to the equation:
-(5c-455)
-5c+455+20=0
We add all the numbers together, and all the variables
-5c+475=0
We move all terms containing c to the left, all other terms to the right
-5c=-475
c=-475/-5
c=+95
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