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    x^2 + 1 < 0
    x(x-3)≤0
    x-0.5x-0.25x-1/7x<6
    x²-3x>0
    2a-1<10 7a+3>1
    2a-1<9 9a+1>2
    2a+3>2 9a+7<10
    0.5x+3(1-0.2x)≥0.4x-0.6
    -7.5+x-x*6%/4≥1000
    2n/(n+2)>(3n-2)÷(2n-2)
    a≥a²+1
    11.107+(-0.2911*x)>0
    -1+x+4x ^2>0
    x ^2-4x+6<0
    (1+x)/(1-x)>0
    1+x/1-x>0
    1-x^2>=1
    abs(2x-1)>2
    3≤2x-8
    -1x-5<3

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