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k in (-oo:+oo)
-5/2 = k/4 // - k/4
-(k/4)-5/2 = 0
-1/4*k-5/2 = 0 // + 5/2
-1/4*k = 5/2 // : -1/4
k = 5/2/(-1/4)
k = -10
k = -10
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