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k in (-oo:+oo)
(1/6)*k = -2/3 // + -2/3
(1/6)*k-(-2/3) = 0
(1/6)*k+2/3 = 0
1/6*k+2/3 = 0 // - 2/3
1/6*k = -2/3 // : 1/6
k = -2/3/1/6
k = -4
k = -4
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