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
    (-2x+160)(x-30)> 800
    (-2x+160)(x-30)<800
    (1000-10n)/sqrt(n)＞1.96
    2x-2>3(x-1) (x/3)-((x-1)/2)<1
    x＋2＜2x
    2x－3≥1
    26<2x+1.5(15-x)<27
    x^2-70x+4500≤0
     6x≤(x^2+1)(2x-1)

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