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k in (-oo:+oo)
-1 = k/4+k/2+1/2 // - k/4+k/2+1/2
-(k/4)-(k/2)-(1/2)-1 = 0
-(k/4)-(k/2)-1/2-1 = 0
-3/4*k-3/2 = 0 // + 3/2
-3/4*k = 3/2 // : -3/4
k = 3/2/(-3/4)
k = -2
k = -2
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