x^2-1<0 x^2-3x<0
    (x-5)(3-2x)＞5
    -1/8*7+7x+4>3+61/12
    ex-3≤1
    3
    3>x^2
    2-5x>2*abs(x-3)
    3x+5
    5/(4-m)>0
    x^3+2x^2+1>4
    68-X-X×10%/4×3≥30
    （260x+40x×70%-12800）÷12800≥80%
    3x≥4x-1 5x-1>2x-4
    3x-1>2x-2
    2x+2≤5x+8 4x-10
    3(x+2)≥2x+5 3x-6<2x-4
    x-5≥0 4-3x<5
    5x-2>7(x-2) 0.5x-1≥7-1.5x
    0.7031b-b/1.3＜b/1.3+0.3/1.3
    n^2-n≥306

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