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15-0.18c=12.66
We move all terms to the left:
15-0.18c-(12.66)=0
We add all the numbers together, and all the variables
-0.18c+2.34=0
We move all terms containing c to the left, all other terms to the right
-0.18c=-2.34
c=-2.34/-0.18
c=+13
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