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=45+18C
We move all terms to the left:
-(45+18C)=0
We add all the numbers together, and all the variables
-(18C+45)=0
We get rid of parentheses
-18C-45=0
We move all terms containing C to the left, all other terms to the right
-18C=45
C=45/-18
C=-2+1/2
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