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2.80+0.75c=7
We move all terms to the left:
2.80+0.75c-(7)=0
We add all the numbers together, and all the variables
0.75c-4.2=0
We move all terms containing c to the left, all other terms to the right
0.75c=4.2
c=4.2/0.75
c=5+0.45/0.75
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