Mathematics
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    abs((x*x-1)/(x-1)-2)< 5
    abs((x*x-1)/(x-1)-2)< 10
    abs(2x-6)< 2
    abs(2x-6)< 1
    abs(2x-6)<0.1
    abs(2x-6)<0.01
    abs(x)<5
    (1/5)(x+5)<(1/7)(3x+4)
    -2(x-3)-6x<-(3x+8)+2x
    4x-4<6x+4
    -14+x>10
    6(2x-1)≤3(3x-5)
    x-1<3(x+1)
    -4x≤8
    a^2-1<0
    5a^2-2a-3<0
    2a^2-3a+1>0
    4a^2-4a-3<0
    abs(x-1)>abs(x+1)
    -x^2+2x-3>0

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