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84c-4=72c-224
We move all terms to the left:
84c-4-(72c-224)=0
We get rid of parentheses
84c-72c+224-4=0
We add all the numbers together, and all the variables
12c+220=0
We move all terms containing c to the left, all other terms to the right
12c=-220
c=-220/12
c=-18+1/3
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