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20-7=5c-7
We move all terms to the left:
20-7-(5c-7)=0
We add all the numbers together, and all the variables
-(5c-7)+13=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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