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(-k,2k,1/2k) + (9,0,6) - (4,6,1) = (9,-14,2)
(-k,2k,1/2k) + (5,-6,5) = (9,-14,2)
(-k,2k,1/2k) = (9,-14,2) - (5,-6,5)
(-k,2k,1/2k) = (4,-8, -3)
=> -k=4
k= -4 E