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k in (-oo:+oo)
(1/6)*k+(3/5)*k+5/9 = 671/90 // - 671/90
(1/6)*k+(3/5)*k+5/9-(671/90) = 0
(1/6)*k+(3/5)*k+5/9-671/90 = 0
23/30*k-69/10 = 0 // + 69/10
23/30*k = 69/10 // : 23/30
k = 69/10/23/30
k = 9
k = 9
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