Mathematics
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    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)
    6x/x^2+1 ≤2x-1
    6x^2/x+1 ≤2x-1
    6x^2/x+1≤2x-1
    X-1/2<x/3

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