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-(k-6)=3
We move all terms to the left:
-(k-6)-(3)=0
We get rid of parentheses
-k+6-3=0
We add all the numbers together, and all the variables
-1k+3=0
We move all terms containing k to the left, all other terms to the right
-k=-3
k=-3/-1
k=+3
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