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k in (-oo:+oo)
-3 = (4*k)/2 // - (4*k)/2
-((4*k)/2)-3 = 0
-2*k-3 = 0
-2*k-3 = 0 // + 3
-2*k = 3 // : -2
k = 3/(-2)
k = -3/2
k = -3/2
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