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4.7+4.2c=5.7c-2.8
We move all terms to the left:
4.7+4.2c-(5.7c-2.8)=0
We get rid of parentheses
4.2c-5.7c+2.8+4.7=0
We add all the numbers together, and all the variables
-1.5c+7.5=0
We move all terms containing c to the left, all other terms to the right
-1.5c=-7.5
c=-7.5/-1.5
c=+5
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