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81=4c-15
We move all terms to the left:
81-(4c-15)=0
We get rid of parentheses
-4c+15+81=0
We add all the numbers together, and all the variables
-4c+96=0
We move all terms containing c to the left, all other terms to the right
-4c=-96
c=-96/-4
c=+24
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