14y+172-8.6y<>199
    14y+172-8.6y>=199
    -1/3≤1/x≤3
    -3/1≤1/x≤3
     ( x -7) / ( x - 5 ) - ( x +5 ) / ( x + 4 ) ≥0
    -1/3≤1/x≤1/3
    (x+3)/(x-5)-(x-3)/(x+5)≤0
    4*x^3-13*x^2-35*x≤0
    6/x+1>1
     x^3-13x^2≥35x
    x^2-4x-32≥x-8
    2x/(x-7)/(x+4)≥0
    2x/(x-7)(x+4)≥0
    (x+9)/(x-2)≥0
    (x-5)/(x+8)＞0
    x^2+5x-50 ≥0
    x^2+5x-36≤0
    l20-3l＜2 20-3x-10＜0
    l20-3l＜2
    x²-3x+2＜0

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