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4.7+2.5c=12.2
We move all terms to the left:
4.7+2.5c-(12.2)=0
We add all the numbers together, and all the variables
2.5c-7.5=0
We move all terms containing c to the left, all other terms to the right
2.5c=7.5
c=7.5/2.5
c=3
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