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k in (-oo:+oo)
k+5/8 = 4*k-(5/4) // - 4*k-(5/4)
k-(4*k)+5/8+5/4 = 0
k-4*k+5/8+5/4 = 0
15/8-3*k = 0 // - 15/8
-3*k = -15/8 // : -3
k = -15/8/(-3)
k = 5/8
k = 5/8
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