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18=6+3k
We move all terms to the left:
18-(6+3k)=0
We add all the numbers together, and all the variables
-(3k+6)+18=0
We get rid of parentheses
-3k-6+18=0
We add all the numbers together, and all the variables
-3k+12=0
We move all terms containing k to the left, all other terms to the right
-3k=-12
k=-12/-3
k=+4
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