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13c-100+3c=c+100
We move all terms to the left:
13c-100+3c-(c+100)=0
We add all the numbers together, and all the variables
16c-(c+100)-100=0
We get rid of parentheses
16c-c-100-100=0
We add all the numbers together, and all the variables
15c-200=0
We move all terms containing c to the left, all other terms to the right
15c=200
c=200/15
c=13+1/3
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