x²≥1
    （x-1）²（x+3）＜0
    2[(2k-1)/4]-3[(3-4k)/2]>0
    7-2*(x+2)<5
    (4x-33)/3-2*(x-4)<-1
    -2a-4<0
    9*x^2+6*x+1≥0
    sqrt(9x^2+6x+1)<2
    sqrt(9x^2+6x+1)<2
    abs(6-5x)<2
    (x+5)(1-x)≥8
    (x+1)(x-1)>0
    (2x-1)/3＜x/2+1
    abs(1-3x)≤3
    (4x-8)^2-16x≤0
    sinx>0 cosx<1/2
    x²≤4
    （10^x）-（6^x）-（3^x）≥1
    10^x-6^x-3^x≥1
    3x(x-17)<9(1-3x)

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