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+(2C+12)=90
We move all terms to the left:
+(2C+12)-(90)=0
We get rid of parentheses
2C+12-90=0
We add all the numbers together, and all the variables
2C-78=0
We move all terms containing C to the left, all other terms to the right
2C=78
C=78/2
C=39
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