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7.8+6.19c=63.51
We move all terms to the left:
7.8+6.19c-(63.51)=0
We add all the numbers together, and all the variables
6.19c-55.71=0
We move all terms containing c to the left, all other terms to the right
6.19c=55.71
c=55.71/6.19
c=9
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