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(260)=0.4C+20
We move all terms to the left:
(260)-(0.4C+20)=0
We get rid of parentheses
-0.4C-20+260=0
We add all the numbers together, and all the variables
-0.4C+240=0
We move all terms containing C to the left, all other terms to the right
-0.4C=-240
C=-240/-0.4
C=+600
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