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