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k in (-oo:+oo)
2291/495 = 6*k+(2/5)*k+5/9 // - 6*k+(2/5)*k+5/9
2291/495-(6*k)-((2/5)*k)-(5/9) = 0
(-2/5)*k-6*k+2291/495-5/9 = 0
224/55-32/5*k = 0 // - 224/55
-32/5*k = -224/55 // : -32/5
k = -224/55/(-32/5)
k = 7/11
k = 7/11
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