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51=3c+6
We move all terms to the left:
51-(3c+6)=0
We get rid of parentheses
-3c-6+51=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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