2(-8+x)≤-4-6
    8-x/9>2
    12−(5x−9)≥7x−3
    (x-3)/2>(3x+5)/4
    x+7≤7
    7>= 2x^2+13x
     sqrt（sqrt(10+a)）+sqrt（sqrt(7-a)） = 3 a≥0
    2<0.118r+167.7/r-5390.35/(r^3)<20
    －1/2x＋3＜－4
    (2x-1)/3-(x+6)/4＜(3x+5)/12+(3x-1)/6
    x＋12 ≥ 3－5x
    (-x+5)/4 ≤(2x+1)/3
    -x+5/4≤2x+1/3
    4(8x)＞40
    x＋2＞0
    3x－4x＞1
    (184*254+600x)/(x+254)＞200
    (184*254+300x)/(x+254)＞200
    (475+4x)/(x+250)>2
    -4082750+3000000+x-45000-2.5%x>=300000

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