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11c=-12c-13
We move all terms to the left:
11c-(-12c-13)=0
We get rid of parentheses
11c+12c+13=0
We add all the numbers together, and all the variables
23c+13=0
We move all terms containing c to the left, all other terms to the right
23c=-13
c=-13/23
c=-13/23
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