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20=10(c-89)
We move all terms to the left:
20-(10(c-89))=0
We calculate terms in parentheses: -(10(c-89)), so:We get rid of parentheses
10(c-89)
We multiply parentheses
10c-890
Back to the equation:
-(10c-890)
-10c+890+20=0
We add all the numbers together, and all the variables
-10c+910=0
We move all terms containing c to the left, all other terms to the right
-10c=-910
c=-910/-10
c=+91
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