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c=4c-45
We move all terms to the left:
c-(4c-45)=0
We get rid of parentheses
c-4c+45=0
We add all the numbers together, and all the variables
-3c+45=0
We move all terms containing c to the left, all other terms to the right
-3c=-45
c=-45/-3
c=+15
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