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