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k in (-oo:+oo)
(-5/9)*k = 2 // - 2
(-5/9)*k-2 = 0
-5/9*k-2 = 0 // + 2
-5/9*k = 2 // : -5/9
k = 2/(-5/9)
k = -18/5
k = -18/5
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