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=500+0.75C
We move all terms to the left:
-(500+0.75C)=0
We add all the numbers together, and all the variables
-(0.75C+500)=0
We get rid of parentheses
-0.75C-500=0
We move all terms containing C to the left, all other terms to the right
-0.75C=500
C=500/-0.75
C=-666+0.5/0.75
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