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