(6+x)*sqrt(0.09-x*x)<0.09
    (6-x)*sqrt(0.09-x*x)<0.09
    x*(6x+5)＜4
    (x-1)/(x+1)<1
    －2000*(1/2)＾x＋80x－40＞0
    2(x^2)-x-3>0
    (2x)^2-x-3>0
    2x^2-x3>0
    -3
    2x^2-x-3>0
    √x+2>3x
    x^2+2>3x
    x^2+2>x
    -x^2-2x+3>0
    x-350<67500
    x-350<67500
    1(1/2)-6x1<=3/2
    1(1/2)-6*1<=3/2
    -x>x
    x>2+x

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