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42=k/6
We move all terms to the left:
42-(k/6)=0
We add all the numbers together, and all the variables
-(+k/6)+42=0
We get rid of parentheses
-k/6+42=0
We multiply all the terms by the denominator
-k+42*6=0
We add all the numbers together, and all the variables
-1k+252=0
We move all terms containing k to the left, all other terms to the right
-k=-252
k=-252/-1
k=+252
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