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