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2.10c=21.39+12.99=
We move all terms to the left:
2.10c-(21.39+12.99)=0
We add all the numbers together, and all the variables
2.10c-(34.38)=0
We add all the numbers together, and all the variables
2.10c-34.38=0
We move all terms containing c to the left, all other terms to the right
2.10c=34.38
c=34.38/2.10
c=16+0.78/2.10
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