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k in (-oo:+oo)
2-k = (1/5)*k+86/55 // - (1/5)*k+86/55
2-k-((1/5)*k)-(86/55) = 0
(-1/5)*k-k-86/55+2 = 0
24/55-6/5*k = 0 // - 24/55
-6/5*k = -24/55 // : -6/5
k = -24/55/(-6/5)
k = 4/11
k = 4/11
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