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k in (-oo:+oo)
(-2/9)*k = 4/11 // - 4/11
(-2/9)*k-(4/11) = 0
(-2/9)*k-4/11 = 0
-2/9*k-4/11 = 0 // + 4/11
-2/9*k = 4/11 // : -2/9
k = 4/11/(-2/9)
k = -18/11
k = -18/11
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