((a^3-3*a^2)^2-4*a^3)≥0
    a^2-4a+1＜0
    20×3x-2>5
    3x+2>8
    2x+1<13
    11(7x+3)>11(-6x-10)
    2(-7x-2)+8x<7-(7x-11)
    -9(8x-2)>-6x+6(-12x-5)
    8(12+x)>12(6x+8)+x
    6(5n+9)+7<-11(1-2n)
    8(b+3)<2(6+4b)+12
    -3(-3x-2)<-(12x-6)
    10(3-8v)+9v<-9v+7(-9v+3)
    -6x^2≤5x+2
    （x-2）（x+2）＞1
    -x^2-4x+5≥0
    4x^2+4x+1＞0
    2x^2+4x+5＜0
    x^2+3x-10＜0
    abs(3a^2-a^3+sqrt(a^3(a-4)(a-1)^2))＜2

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