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k in (-oo:+oo)
293/33 = (-4/5)*k+(2/3)*k+9 // - (-4/5)*k+(2/3)*k+9
293/33-((-4/5)*k)-((2/3)*k)-9 = 0
(4/5)*k+(-2/3)*k+293/33-9 = 0
2/15*k-4/33 = 0 // + 4/33
2/15*k = 4/33 // : 2/15
k = 4/33/2/15
k = 10/11
k = 10/11
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