4x^2-4x＞15
    -4≤x^2-3x＜18
    468-3x＞160-x
    x＋1/3-x≥0
    2x^2-x-6＞0
    2000+0.23*100*x > 0.5*100*x
    5*x>10
    x2-2021×x+2020＜0
    x2-2021x+2020＜0
    2X-5/X-1>1
    200*135+95*2*6*（x+200/x)<70000
     x * 6.00 < ( x - 15 ) * 6.035
     x * 6.7463 < ( x - 15 ) * 6.7813
    x * 0.997 * 6.7463 < ( x - 15 ) * 6.7813
    x * 0.997 *6< ( x - 15 ) * 6.035
    x*0.997 <(x-15)*1.035
    x*0.997<(x-15)
    x*0.997 > x-15
    x*0.003<15
    -1/a>4

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