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=40.00-0.09C
We move all terms to the left:
-(40.00-0.09C)=0
We add all the numbers together, and all the variables
-(-0.09C+40)=0
We get rid of parentheses
0.09C-40=0
We move all terms containing C to the left, all other terms to the right
0.09C=40
C=40/0.09
C=444+0.039999999999999/0.09
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