n^2-20n-4>0
    900/(y)^2-108000/y＞-4107793.367
    3x^3+2x^2+13x+6>0
    x^4+x^3-2x+3<0
    x^4-x^3-2x+3<0
    x^3-3x^2-24x>28
    a^2-16a+4＜0
    x^3+5x^2+2x-8>0
    2x^2+7x-4>0
    x^2-40x+160<=0
    x^2+x+1>=0
    4*y*y-2*y-(7/2)>=0
    (-2+0.5*y)^2-(15/4)*(-y*y+2)>=0
    4*y*y-y-(7/2)>=0
    (-2+0.5*y)^2-(15/4)*(-y*y+2)>=0
    (-2+2*y)-(15/4)(-y*y+2)>=0
    (-(33/16)+(1/2)*a)-4(-a*a+2) >= 0
    (-2-(1/16)+(1/2)*a)-4(-a*a+2)>=0
    -x^2-2x-1>=0
    x^2-2x-8>=0

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