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x in (-oo:+oo)
5-(3*x) > -1/5 // + -1/5
5-(3*x)-(-1/5) > 0
1/5-3*x+5 > 0
26/5-3*x > 0 // - 26/5
-3*x > -26/5 // : -3
x < -26/5/(-3)
x < 26/15
x in (-oo:26/15)
(-oo:26/15)
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