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3.9c=1.56
We move all terms to the left:
3.9c-(1.56)=0
We add all the numbers together, and all the variables
3.9c-1.56=0
We move all terms containing c to the left, all other terms to the right
3.9c=1.56
c=1.56/3.9
c=1/2.5
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