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=5C+3*10
We move all terms to the left:
-(5C+3*10)=0
We add all the numbers together, and all the variables
-(5C+30)=0
We get rid of parentheses
-5C-30=0
We move all terms containing C to the left, all other terms to the right
-5C=30
C=30/-5
C=-6
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