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90+9c=90(c+10)
We move all terms to the left:
90+9c-(90(c+10))=0
We calculate terms in parentheses: -(90(c+10)), so:We get rid of parentheses
90(c+10)
We multiply parentheses
90c+900
Back to the equation:
-(90c+900)
9c-90c-900+90=0
We add all the numbers together, and all the variables
-81c-810=0
We move all terms containing c to the left, all other terms to the right
-81c=810
c=810/-81
c=-10
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