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k in (-oo:+oo)
3/4 = 5*k // - 5*k
3/4-(5*k) = 0
3/4-5*k = 0
3/4-5*k = 0 // - 3/4
-5*k = -3/4 // : -5
k = -3/4/(-5)
k = 3/20
k = 3/20
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