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6+1+3.20c=18.20
We move all terms to the left:
6+1+3.20c-(18.20)=0
We add all the numbers together, and all the variables
3.20c+6+1-(18.2)=0
We add all the numbers together, and all the variables
3.20c-11.2=0
We move all terms containing c to the left, all other terms to the right
3.20c=11.2
c=11.2/3.20
c=3+1/2
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