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z in (-oo:+oo)
z/(-5) > 50 // - 50
z/(-5)-50 > 0
-1/5*z-50 > 0 // + 50
-1/5*z > 50 // : -1/5
z < 50/(-1/5)
z < -250
z in (-oo:-250)
(-oo:-250)
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