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=85C+60-315
We move all terms to the left:
-(85C+60-315)=0
We add all the numbers together, and all the variables
-(85C-255)=0
We get rid of parentheses
-85C+255=0
We move all terms containing C to the left, all other terms to the right
-85C=-255
C=-255/-85
C=+3
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