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
    16x^2-129x+256＞0
     -3 >34 / 21 * x
    -3>34/21x
    2-(4/3)x>(2/7)x+5
    2-4/3x>2/7x+5
    -3/2x+5<-2/3x+1
    -2/5x+2<3
    1/3x+4>3
    6*x ^ 2+8 * x+9>0
    15+x>6
    0<（1+x）（1-x/1.5）<1
    1-3m＜0 m-4＜0
    1-3m＜0

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