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-6(c-9)=42
We move all terms to the left:
-6(c-9)-(42)=0
We multiply parentheses
-6c+54-42=0
We add all the numbers together, and all the variables
-6c+12=0
We move all terms containing c to the left, all other terms to the right
-6c=-12
c=-12/-6
c=+2
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