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15c+1-12=13c+3
We move all terms to the left:
15c+1-12-(13c+3)=0
We add all the numbers together, and all the variables
15c-(13c+3)-11=0
We get rid of parentheses
15c-13c-3-11=0
We add all the numbers together, and all the variables
2c-14=0
We move all terms containing c to the left, all other terms to the right
2c=14
c=14/2
c=7
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