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-20=-9C+10
We move all terms to the left:
-20-(-9C+10)=0
We get rid of parentheses
9C-10-20=0
We add all the numbers together, and all the variables
9C-30=0
We move all terms containing C to the left, all other terms to the right
9C=30
C=30/9
C=3+1/3
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