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93=63-c
We move all terms to the left:
93-(63-c)=0
We add all the numbers together, and all the variables
-(-1c+63)+93=0
We get rid of parentheses
1c-63+93=0
We add all the numbers together, and all the variables
c+30=0
We move all terms containing c to the left, all other terms to the right
c=-30
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