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7.9-4c=6.7
We move all terms to the left:
7.9-4c-(6.7)=0
We add all the numbers together, and all the variables
-4c+1.2=0
We move all terms containing c to the left, all other terms to the right
-4c=-1.2
c=-1.2/-4
c=1/3.3333333333333
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