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x in (-oo:+oo)
30-((3*x)/2) < 0
(-3/2)*x+30 < 0
30-3/2*x < 0 // - 30
-3/2*x < -30 // : -3/2
x > -30/(-3/2)
x > 20
x in (20:+oo)
(20:+oo)
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