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k in (-oo:+oo)
(3/4)*k-4 = 7 // - 7
(3/4)*k-7-4 = 0
3/4*k-11 = 0 // + 11
3/4*k = 11 // : 3/4
k = 11/3/4
k = 44/3
k = 44/3
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