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k in (-oo:+oo)
5/8 = (5/8)*k // - (5/8)*k
5/8-((5/8)*k) = 0
(-5/8)*k+5/8 = 0
5/8-5/8*k = 0 // - 5/8
-5/8*k = -5/8 // : -5/8
k = -5/8/(-5/8)
k = 1
k = 1
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