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x in (-oo:+oo)
x/3 < 1/2 // - 1/2
x/3-(1/2) < 0
x/3-1/2 < 0
1/3*x-1/2 < 0 // + 1/2
1/3*x < 1/2 // : 1/3
x < 1/2/1/3
x < 3/2
x in (-oo:3/2)
(-oo:3/2)
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