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k in (-oo:+oo)
0.125 = k/8 // - k/8
0.125-(k/8) = 0
0.125-1/8*k = 0 // - 0.125
-1/8*k = -0.125 // : -1/8
k = -0.125/(-1/8)
k = 1
k = 1
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