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28=3c-11
We move all terms to the left:
28-(3c-11)=0
We get rid of parentheses
-3c+11+28=0
We add all the numbers together, and all the variables
-3c+39=0
We move all terms containing c to the left, all other terms to the right
-3c=-39
c=-39/-3
c=+13
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