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k in (-oo:+oo)
(3/4)*k-(1/3) = 1/2 // - 1/2
(3/4)*k-(1/3)-(1/2) = 0
(3/4)*k-1/3-1/2 = 0
3/4*k-5/6 = 0 // + 5/6
3/4*k = 5/6 // : 3/4
k = 5/6/3/4
k = 10/9
k = 10/9
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