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20c-12=15+16
We move all terms to the left:
20c-12-(15+16)=0
We add all the numbers together, and all the variables
20c-12-31=0
We add all the numbers together, and all the variables
20c-43=0
We move all terms containing c to the left, all other terms to the right
20c=43
c=43/20
c=2+3/20
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