X+X*9%=2234
    X+X*9%=20460
    7y<4y+20<8y
    5x/6-1+2>X/4+5
    2x+5≤3（5-x）
    x^(2)+4x-5<0
    3+x<9
    {3x+2>2(x-2) {3x-4<=11-2x
    3x+2>2(x-2) 3x-4<=11-2x
    2/1
    1－2X≥2/X+7
    3x+>2(x-2) 3x-4<=11-2x
    3x+> 2(x-2) 3x-4<=11-2x
    3x+2(x-2) 3x-4<=11-2x
    1－2X≥X+7/2
    3x+2(x-2);3x-4<=11-2x
    -x+3≥0
    XX+9>5
    1/3x ^2+1/5x-1/7>0
    x ^2+x-1>0

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