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14.80c+17c=91
We move all terms to the left:
14.80c+17c-(91)=0
We add all the numbers together, and all the variables
31.8c-91=0
We move all terms containing c to the left, all other terms to the right
31.8c=91
c=91/31.8
c=2+19.5714285714/22.7142857143
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