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