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k in (-oo:+oo)
8-((3/8)*k) = -17 // + 17
8-((3/8)*k)+17 = 0
(-3/8)*k+8+17 = 0
25-3/8*k = 0 // - 25
-3/8*k = -25 // : -3/8
k = -25/(-3/8)
k = 200/3
k = 200/3
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