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=30.50-0.07C
We move all terms to the left:
-(30.50-0.07C)=0
We add all the numbers together, and all the variables
-(-0.07C+30.5)=0
We get rid of parentheses
0.07C-30.5=0
We move all terms containing C to the left, all other terms to the right
0.07C=30.5
C=30.5/0.07
C=435+0.049999999999997/0.07
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