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