1/2x^2+4.75x-0.5<0
    2/(m-2)<0
    2/m-2<0
    3t^2+15t-320≤0
    （-x＋5）（x－3）＞0
    -5<(2x+1)/(2x-1)<5
    12x+0.6>2.5-5x
    10(2x-0.5)-4(2x-1.4)>5(0.5-x)
    -7x-19≥4x-4
    [(x-2)/3]-[(3x+5)/2]≥x-[(2-x)3]
    2x-8<13
    x+3<3x+2
    6+3x≥4x-2+6
    (y+3)/2≤(3/4)(2y-5)
    x≤1
    X²-3X+5>0
    X²-2X+1>0
    3x²×17x≤0
    1X²＋1400x≤4800
    b-√b²-12＞1

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