b+3<-b/2
    b<-b/2
    b<-b/2<>
    x^(2)-x-1≥0
    4x^(2)-4x+15>0
    3x-7≥8-2x+7
    (2x-3)-3>(-3x-2)^(2)
    (2x+1）^(2)－（x-2）^(3)>1
    -(7+5y)<2y+(5-3y)
    2（3x-1）-3(4x+5)≤x-4(x-7)
    2x^2-12x-4<0
    1＋2x╱3>x－1
    x－3（x－2）≥4
    x－3（x－2）
    －x╱5>x＋1╱2
    3（x－1）<4x－2
    x＋2╱2>x＋3╱3
    x＋2/2>x＋3/3
    1/2（x＋3）<2
    2x>x－1

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