Mathematics
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    9≤x²
    -9x²+6x-1≥0
    (2k-3)/(4-k) <0
    (2k-3)/(4-k)>=-1
    a+1/a<0
    a+1/a>0
    3(2k+5)/2<5k-1
    X/2-3x>10
    -9x²+6x-1≥0
    -9x²+6x+1≥0
    4x²+12x+9>0
    -4x≥x²
    -x²+x+42<0
    x²+x-30≤0
    2x²-5x-3<0
    √(R^2-468.72)+16-(√(R^2-240.25))≥37.5-26.846
    x+40/1≥0.7
    (x+2)(x-4)≤0
    (1+10x)/(1+x)>9.95
    (1+5x)/(1+x)>9.95

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