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7(c-18)=-56
We move all terms to the left:
7(c-18)-(-56)=0
We add all the numbers together, and all the variables
7(c-18)+56=0
We multiply parentheses
7c-126+56=0
We add all the numbers together, and all the variables
7c-70=0
We move all terms containing c to the left, all other terms to the right
7c=70
c=70/7
c=10
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