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87=24+7c
We move all terms to the left:
87-(24+7c)=0
We add all the numbers together, and all the variables
-(7c+24)+87=0
We get rid of parentheses
-7c-24+87=0
We add all the numbers together, and all the variables
-7c+63=0
We move all terms containing c to the left, all other terms to the right
-7c=-63
c=-63/-7
c=+9
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