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10+5.50c=20
We move all terms to the left:
10+5.50c-(20)=0
We add all the numbers together, and all the variables
5.50c-10=0
We move all terms containing c to the left, all other terms to the right
5.50c=10
c=10/5.50
c=1+3/3.6666666666667
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