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+20=-4C+55
We move all terms to the left:
+20-(-4C+55)=0
We get rid of parentheses
4C-55+20=0
We add all the numbers together, and all the variables
4C-35=0
We move all terms containing C to the left, all other terms to the right
4C=35
C=35/4
C=8+3/4
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