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