-（3/5x）＞1-【3/（27-4x）】
    -（5x/3）＞1-(27/3-4x)
    -5x/3＞1-27/3-4x
    {20x-30（100-x）≤2800 40x-20（100-x）≤2800
    x^2-9≥=0
    9-x^2≥=0
    x^2-9>=0
    x^2≥0
    x^4+2x^3+5x^2+4x-4>0
    x^2-2x-3>0
    121-x^2>=0
    sin(x)>0
    cos(x)>0
    2cos(x)+1>0
    x-3＜2022/180 2022/180＜x-2
    a(120-a)-500-30a>1300
    abs(3-2a)<4
    abs3-2a<4
    -1 <= ( 2 * x - 1 ) / 7
     -1 <= ( 2 * x - 1 ) / 7

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