(20+m)^2>48(12+m)
     16+8t-1 > 4+4t-1 > -2t-1
    x^3-3>0
    3x+5×0≤25
    3×0+5y≤25
    x-4×0≤-3
    {51x+2xx>1500 {x>0
    51x+2xx>1500 x>0
    0-4y≤－3
    （2x＋3）÷3-1＜x-2
    2x＋3≤x＋11
    x-2（x-1)≥1
    2x＋4＞0
    (2x+1)/3-(1-x)/2<1
    4x<(x-7)/2
    2x-4>3(x-2)
    -3<=(3x-2)/4<1
    3x-4<3
    1-x>4
    (3x+2)/4-(7x-3)/8>2

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