(x+20-158)/(x+20)>3/155
    3/155
    3/155
    6*abs（3-4*x）-1/4>=1/2
    （y－5）（y－3）≥2（y－3）＾2
    x^2-9＞0
    x^2+2x-8＞0
    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

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