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k in (-oo:+oo)
9/2 = (-8/9)*k // - (-8/9)*k
9/2-((-8/9)*k) = 0
(8/9)*k+9/2 = 0
8/9*k+9/2 = 0 // - 9/2
8/9*k = -9/2 // : 8/9
k = -9/2/8/9
k = -81/16
k = -81/16
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