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x in (-oo:+oo)
-4*k-((5*l)/(-9)) = 9*k-((6*m)/7) // - 9*k-((6*m)/7)
(6*m)/7-4*k-(9*k)-((5*l)/(-9)) = 0
(5/9)*l-4*k-9*k+(6*m)/7 = 0
5/9*l-13*k+6/7*m = 0
x naleu017Cy do R
x in (-oo:+oo)
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