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z in (-oo:+oo)
-z/2 < 9 // - 9
-z/2-9 < 0
-1/2*z-9 < 0 // + 9
-1/2*z < 9 // : -1/2
z > 9/(-1/2)
z > -18
z in (-18:+oo)
(-18:+oo)
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