-2
    x^4-2x^3-3x^2<0
    5x − 1/x + 2≤ 8
    50<2^(x-1)
    (2x − 7)(9x + 9) ≤ 0
    x/2+4<=1
    2(x-3)-3(x-2)>-6
    x/2-x/3>-1
     x/2-x/3>-1
     x+8<4x-1
     2x-1>x+1
     2x-2>x+1
    （x-2)/2>x/3
    （x-2)/2>x-2
    （x-2)/2>x/2
    (x-2)/2>x/3
    6x-6x<12
    (x-2)/2
    x-2/2
    1-4/X^2<0

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