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13.64+c=21.00
We move all terms to the left:
13.64+c-(21.00)=0
We add all the numbers together, and all the variables
c+13.64-21=0
We add all the numbers together, and all the variables
c-7.36=0
We move all terms containing c to the left, all other terms to the right
c=7.36
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