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x in (-oo:+oo)
5*x-(1/3) < 4 // - 4
5*x-(1/3)-4 < 0
5*x-1/3-4 < 0
5*x-13/3 < 0 // + 13/3
5*x < 13/3 // : 5
x < 13/3/5
x < 13/15
x in (-oo:13/15)
(-oo:13/15)
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