3x^2+6＜0
    x^3+x+1＞0
    （x+1）/3＜3（x-1）-4
    （1+x）/3＜x-1
    2x-3＜5（x-1）
    2x+9≤15
    10*x+8*(60-x)≤529
    x-3/x＋2＜2
    -2x^2+x+3>=0
    52x+28(30-x)<96
    5-4(x-1)(-x-1)<(2x-3)^2-1 5-4(x-1)(-x-1)<(2x-3)^2+1
    5-4(x-1)(-x-1)<(2x-3)^2 5-4(x-1)(-x-1)<(2x-3)^2
    5-4(x-1)(-x-1)<(2x-3)^2
    5-4*(x-1)*(-1-x)<(2x-3)^2
    x^2+x-1＜0
    -x^2-x≥-2
    -x^2-8≥-2
    x^2-2x+15≤0
    (6-2*a)^2*a>16
    -2x^2+3x≤-5

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