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99=15+7c
We move all terms to the left:
99-(15+7c)=0
We add all the numbers together, and all the variables
-(7c+15)+99=0
We get rid of parentheses
-7c-15+99=0
We add all the numbers together, and all the variables
-7c+84=0
We move all terms containing c to the left, all other terms to the right
-7c=-84
c=-84/-7
c=+12
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