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7(c-13)=-42
We move all terms to the left:
7(c-13)-(-42)=0
We add all the numbers together, and all the variables
7(c-13)+42=0
We multiply parentheses
7c-91+42=0
We add all the numbers together, and all the variables
7c-49=0
We move all terms containing c to the left, all other terms to the right
7c=49
c=49/7
c=7
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