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k in (-oo:+oo)
k/(-4) = -3/4 // + -3/4
k/(-4)-(-3/4) = 0
k/(-4)+3/4 = 0
3/4-1/4*k = 0 // - 3/4
-1/4*k = -3/4 // : -1/4
k = -3/4/(-1/4)
k = 3
k = 3
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