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10c-13=5c+7
We move all terms to the left:
10c-13-(5c+7)=0
We get rid of parentheses
10c-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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