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k in (-oo:+oo)
(1/10)*k-(1/15) = -1/(-6) // + -1/(-6)
(1/10)*k-(1/15)-(-1/(-6)) = 0
(1/10)*k-1/15-1/6 = 0
1/10*k-7/30 = 0 // + 7/30
1/10*k = 7/30 // : 1/10
k = 7/30/1/10
k = 7/3
k = 7/3
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