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x in (-oo:+oo)
(-2/5)*x-(5/3) < -9/5 // + -9/5
(-2/5)*x-(5/3)-(-9/5) < 0
(-2/5)*x-5/3+9/5 < 0
2/15-2/5*x < 0 // - 2/15
-2/5*x < -2/15 // : -2/5
x > -2/15/(-2/5)
x > 1/3
x in (1/3:+oo)
(1/3:+oo)
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