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0.5+3.7c=7.9
We move all terms to the left:
0.5+3.7c-(7.9)=0
We add all the numbers together, and all the variables
3.7c-7.4=0
We move all terms containing c to the left, all other terms to the right
3.7c=7.4
c=7.4/3.7
c=2
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