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51=63-c
We move all terms to the left:
51-(63-c)=0
We add all the numbers together, and all the variables
-(-1c+63)+51=0
We get rid of parentheses
1c-63+51=0
We add all the numbers together, and all the variables
c-12=0
We move all terms containing c to the left, all other terms to the right
c=12
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