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z in (-oo:+oo)
z/(-2) > 3 // - 3
z/(-2)-3 > 0
-1/2*z-3 > 0 // + 3
-1/2*z > 3 // : -1/2
z < 3/(-1/2)
z < -6
z in (-oo:-6)
(-oo:-6)
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