5-2x<=-1
    -2x<=-6
    -4>=-9x
    4x-4>-5x
    x>=(40-x)*5/6
    2320x+1900(40-x)<=85000
    x^2-1/x^2＜0
    (3-2x)/2＜x
    5-2(x-3)≤3
    5-(2x-3)≤3
    6(((2/3)x)+1)>2x-5 7(x-1)<4x+3
    （15-2x）≤x/2
    2000x+2400x+1600(15-2x)≤32400
    3-2x>0 2x-7<4x+7
    3<((2x-3)/5)<4
    2x-1>0 x-3<2
    35＋55（4－a）≥175
    23－x/100×0.6≤20
    （75x-500）/500×100%≥5%
    (-2x+160)(x-30)>800

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