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-13=5c+7
We move all terms to the left:
-13-(5c+7)=0
We get rid of parentheses
-5c-7-13=0
We add all the numbers together, and all the variables
-5c-20=0
We move all terms containing c to the left, all other terms to the right
-5c=20
c=20/-5
c=-4
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