x-1<3x
    2x-2
    9x>7x-6
    -3x≥-9
    2*x*e^(-x^2)<1
    （x+1）/2-（2x-1）＞2
    2x+2-(2x-6)>2x-6-16
    2x+2>2x-6>16
    8>22-2x>0
    2/3x+2＞0
    3x-4>2x
    5/12-（x-1）/3≤x/6
    2x/7-3/2＞（5x-6）/14
    （3x+5）/4＞（-11x-49）/16
    1.732sin(x)>=cos(x)
    (2x-1)^-3/5＞(3-x)^-3/5
    (2x-1)^4/5＞(3-x)^4/5
    (2x-1)^3/5＞(3-x)^3/5
    (2x-1)^3/4＞(3-x)^3/4
    x^6-x-x^3+x^2+1>0

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