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k in (-oo:+oo)
7/10 = k/8 // - k/8
7/10-(k/8) = 0
7/10-1/8*k = 0 // - 7/10
-1/8*k = -7/10 // : -1/8
k = -7/10/(-1/8)
k = 28/5
k = 28/5
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