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5+7c=2.80
We move all terms to the left:
5+7c-(2.80)=0
We add all the numbers together, and all the variables
7c+5-(2.8)=0
We add all the numbers together, and all the variables
7c+2.2=0
We move all terms containing c to the left, all other terms to the right
7c=-2.2
c=-2.2/7
c=-2.2/7
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