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