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z in (-oo:+oo)
-z/5 > 2 // - 2
-z/5-2 > 0
-1/5*z-2 > 0 // + 2
-1/5*z > 2 // : -1/5
z < 2/(-1/5)
z < -10
z in (-oo:-10)
(-oo:-10)
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