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7c+5c=10.45
We move all terms to the left:
7c+5c-(10.45)=0
We add all the numbers together, and all the variables
12c-10.45=0
We move all terms containing c to the left, all other terms to the right
12c=10.45
c=10.45/12
c=4.26530612245/4.89795918367
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