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k in (-oo:+oo)
100/60 = k/3 // - k/3
100/60-(k/3) = 0
5/3-1/3*k = 0 // - 5/3
-1/3*k = -5/3 // : -1/3
k = -5/3/(-1/3)
k = 5
k = 5
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