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k in (-oo:+oo)
-12 = (-3/2)*k // - (-3/2)*k
-((-3/2)*k)-12 = 0
(3/2)*k-12 = 0
3/2*k-12 = 0 // + 12
3/2*k = 12 // : 3/2
k = 12/3/2
k = 8
k = 8
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