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(C.3)=135
We move all terms to the left:
(C.3)-(135)=0
We add all the numbers together, and all the variables
(+C.3)-135=0
We get rid of parentheses
C.3-135=0
We move all terms containing C to the left, all other terms to the right
C.3=135
C=135/1
C=135
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