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x in (-oo:+oo)
-x/3 < -5 // + 5
5-x/3 < 0
5-1/3*x < 0 // - 5
-1/3*x < -5 // : -1/3
x > -5/(-1/3)
x > 15
x in (15:+oo)
(15:+oo)
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