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k in (-oo:+oo)
(3/4)*k-(1/6) = 1/5 // - 1/5
(3/4)*k-(1/6)-(1/5) = 0
(3/4)*k-1/6-1/5 = 0
3/4*k-11/30 = 0 // + 11/30
3/4*k = 11/30 // : 3/4
k = 11/30/3/4
k = 22/45
k = 22/45
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