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k in (-oo:+oo)
7/10 = 8*k // - 8*k
7/10-(8*k) = 0
7/10-8*k = 0
7/10-8*k = 0 // - 7/10
-8*k = -7/10 // : -8
k = -7/10/(-8)
k = 7/80
k = 7/80
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