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(C)=30.00-0.09C
We move all terms to the left:
(C)-(30.00-0.09C)=0
We add all the numbers together, and all the variables
C-(-0.09C+30)=0
We get rid of parentheses
C+0.09C-30=0
We add all the numbers together, and all the variables
1.09C-30=0
We move all terms containing C to the left, all other terms to the right
1.09C=30
C=30/1.09
C=27+0.57/1.09
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