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-13=-6+7c
We move all terms to the left:
-13-(-6+7c)=0
We add all the numbers together, and all the variables
-(7c-6)-13=0
We get rid of parentheses
-7c+6-13=0
We add all the numbers together, and all the variables
-7c-7=0
We move all terms containing c to the left, all other terms to the right
-7c=7
c=7/-7
c=-1
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