x-3/x+2<0
    (x+1)(x-2)≤0
    -3x×x+5x-2>0
    -x×x+2x-3<0
    a3+3a2-a>3
    -4x×x+18x-81/4≥0
    -2x×x+3x-2<0
    x^3>5+6
    2x×x+7x+3>0
    2*x^2-7*x<-5
    x<1080/4
    4<4/x<5
    720/144-1<1080/x<720/144
    0<4/x<2
    x<1080/x<720/144
    0<8/x<4
    8/x<4
    1080/x≤5
    10/x≤5
    10/x≤20

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