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x in (-oo:+oo)
(-75*x)/4 > 225/2 // - 225/2
(-75*x)/4-(225/2) > 0
(-75*x)/4-225/2 > 0
-75/4*x-225/2 > 0 // + 225/2
-75/4*x > 225/2 // : -75/4
x < 225/2/(-75/4)
x < -6
x in (-oo:-6)
(-oo:-6)
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