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-3(4c+8)=18
We move all terms to the left:
-3(4c+8)-(18)=0
We multiply parentheses
-12c-24-18=0
We add all the numbers together, and all the variables
-12c-42=0
We move all terms containing c to the left, all other terms to the right
-12c=42
c=42/-12
c=-3+1/2
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