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k in (-oo:+oo)
3/4 = 4*k // - 4*k
3/4-(4*k) = 0
3/4-4*k = 0
3/4-4*k = 0 // - 3/4
-4*k = -3/4 // : -4
k = -3/4/(-4)
k = 3/16
k = 3/16
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