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15c+16=13c-12
We move all terms to the left:
15c+16-(13c-12)=0
We get rid of parentheses
15c-13c+12+16=0
We add all the numbers together, and all the variables
2c+28=0
We move all terms containing c to the left, all other terms to the right
2c=-28
c=-28/2
c=-14
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