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-2=13+c.
We move all terms to the left:
-2-(13+c.)=0
We add all the numbers together, and all the variables
-(c.+13)-2=0
We get rid of parentheses
-c.-13-2=0
We add all the numbers together, and all the variables
-c.-15=0
We move all terms containing c to the left, all other terms to the right
-c.=15
c=15/1
c=15
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