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k in (-oo:+oo)
-11/3 = (-7/6)*k-((2/3)*k) // - (-7/6)*k-((2/3)*k)
(2/3)*k-((-7/6)*k)-11/3 = 0
(7/6)*k+(2/3)*k-11/3 = 0
11/6*k-11/3 = 0 // + 11/3
11/6*k = 11/3 // : 11/6
k = 11/3/11/6
k = 2
k = 2
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