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(0)=0.75C+9
We move all terms to the left:
(0)-(0.75C+9)=0
We add all the numbers together, and all the variables
-(0.75C+9)=0
We get rid of parentheses
-0.75C-9=0
We move all terms containing C to the left, all other terms to the right
-0.75C=9
C=9/-0.75
C=-12
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