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x in (-oo:+oo)
(-9/4)*x < -72 // + 72
(-9/4)*x+72 < 0
72-9/4*x < 0 // - 72
-9/4*x < -72 // : -9/4
x > -72/(-9/4)
x > 32
x in (32:+oo)
(32:+oo)
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