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7(c+53)=-21
We move all terms to the left:
7(c+53)-(-21)=0
We add all the numbers together, and all the variables
7(c+53)+21=0
We multiply parentheses
7c+371+21=0
We add all the numbers together, and all the variables
7c+392=0
We move all terms containing c to the left, all other terms to the right
7c=-392
c=-392/7
c=-56
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