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k in (-oo:+oo)
(3/4)*k-4 = 1 // - 1
(3/4)*k-4-1 = 0
3/4*k-5 = 0 // + 5
3/4*k = 5 // : 3/4
k = 5/3/4
k = 20/3
k = 20/3
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