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=85-2C
We move all terms to the left:
-(85-2C)=0
We add all the numbers together, and all the variables
-(-2C+85)=0
We get rid of parentheses
2C-85=0
We move all terms containing C to the left, all other terms to the right
2C=85
C=85/2
C=42+1/2
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