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z in (-oo:+oo)
z/(-4) > 36 // - 36
z/(-4)-36 > 0
-1/4*z-36 > 0 // + 36
-1/4*z > 36 // : -1/4
z < 36/(-1/4)
z < -144
z in (-oo:-144)
(-oo:-144)
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