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(50)=0.85C+9
We move all terms to the left:
(50)-(0.85C+9)=0
We get rid of parentheses
-0.85C-9+50=0
We add all the numbers together, and all the variables
-0.85C+41=0
We move all terms containing C to the left, all other terms to the right
-0.85C=-41
C=-41/-0.85
C=48+0.2/0.85
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