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=40.50-0.09C
We move all terms to the left:
-(40.50-0.09C)=0
We add all the numbers together, and all the variables
-(-0.09C+40.5)=0
We get rid of parentheses
0.09C-40.5=0
We move all terms containing C to the left, all other terms to the right
0.09C=40.5
C=40.5/0.09
C=450
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