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k in (-oo:+oo)
-21/8 = (17/4)*k // - (17/4)*k
-((17/4)*k)-21/8 = 0
(-17/4)*k-21/8 = 0
-17/4*k-21/8 = 0 // + 21/8
-17/4*k = 21/8 // : -17/4
k = 21/8/(-17/4)
k = -21/34
k = -21/34
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