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k in (-oo:+oo)
(3/8)*k+17 = 4 // - 4
(3/8)*k-4+17 = 0
3/8*k+13 = 0 // - 13
3/8*k = -13 // : 3/8
k = -13/3/8
k = -104/3
k = -104/3
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