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69=15+3c
We move all terms to the left:
69-(15+3c)=0
We add all the numbers together, and all the variables
-(3c+15)+69=0
We get rid of parentheses
-3c-15+69=0
We add all the numbers together, and all the variables
-3c+54=0
We move all terms containing c to the left, all other terms to the right
-3c=-54
c=-54/-3
c=+18
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