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-7c-3=9c-13
We move all terms to the left:
-7c-3-(9c-13)=0
We get rid of parentheses
-7c-9c+13-3=0
We add all the numbers together, and all the variables
-16c+10=0
We move all terms containing c to the left, all other terms to the right
-16c=-10
c=-10/-16
c=5/8
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