0＜1+x/1-x＜1
    1+x/1-x＞1
    (2x-1)/3-(5x+1)/2<=1 5x-2<3(x+2)
    (m+1)/3>=m-(m-1)/2;(m-3)/2+3
    a+3(a-6)<-2 1+2a>a-1
    3x-1
    m-8<=2(m+2) m/2+4<1
    2(y+3)-1>=1 y+2<2(y+3)
    2(m+3)>10 3m+1>7m-3
    3>2x+5 3x
    3>2x+5.3x
    1/4(c-2)<=1/5(2c+1)
    x^3+3*x^2+2*x-1≥0
    x^3-x-3≤0
    x^3+2*x^2-3*x-8≤0
    5*(x+10*5)
    4*(x+10*4)
    3*(x+10*3)
    2*(x+10*2)
    1*(x+10*1)

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