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93=2c+39
We move all terms to the left:
93-(2c+39)=0
We get rid of parentheses
-2c-39+93=0
We add all the numbers together, and all the variables
-2c+54=0
We move all terms containing c to the left, all other terms to the right
-2c=-54
c=-54/-2
c=+27
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