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x in (-oo:+oo)
(-2/5)*x < -5 // + 5
(-2/5)*x+5 < 0
5-2/5*x < 0 // - 5
-2/5*x < -5 // : -2/5
x > -5/(-2/5)
x > 25/2
x in (25/2:+oo)
(25/2:+oo)
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