Mathematics
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    (5+2x)(3-x)<0
    -2x^2+72x+320>870
    -2a(2a+1)<0
    (x^2-2x)^2+(x-2)(4-x)<0
    x^4+4x^3+4x^2+x^2-2x<0
    (2x-1.5)²-4x×5.5<0
    200(x-10)^2+66000<=540000
    3-3X^2 <0
    3-3X^2>0
    log(2,3-x)≦3
    abs(2x+3>13
    15-absx>5
    abs(1/2x-3)>=1
    (2-3x)^2<=1
    -x^2+5x+6>=0
    -3x^2-20x+7<=0
    5-8x<4x-1
    1-1/x<=-2<=1+1/x
    x+1≥-x^2+2x+3
    x+1≤-x^2+2x+3

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