x^2+x-2＞0
    x^2-3x＞0
    x^2-4x＞0
    −2n≤28
    −6f+3<51
    5v+2>82
    2t≥−3t−30
    −3a+7<28
    b−2≤−8b+25
    0.7s+0.04>0.6
    4y -7< y +114y−7
    3c−11c≤48
    −7r>−4r−69
    4y−7
    −45≥5n
    2x+9≥−x−33
    abs（x^2-4x+1）＞3x
    abs（abs（x+3）-abs（x-3））＜3
    abs（x+7）-abs（x-2）＜3
    abs（x-5）-abs（2x-3）＜1

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