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k in (-oo:+oo)
k-(4*k)-10 = -122/11 // + -122/11
k-(4*k)-(-122/11)-10 = 0
k-4*k+122/11-10 = 0
12/11-3*k = 0 // - 12/11
-3*k = -12/11 // : -3
k = -12/11/(-3)
k = 4/11
k = 4/11
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