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68=13+5c
We move all terms to the left:
68-(13+5c)=0
We add all the numbers together, and all the variables
-(5c+13)+68=0
We get rid of parentheses
-5c-13+68=0
We add all the numbers together, and all the variables
-5c+55=0
We move all terms containing c to the left, all other terms to the right
-5c=-55
c=-55/-5
c=+11
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