Mathematics
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    2x^2+x-1=0
    x+【0.2*(x-0.3)】/(x-0.4)-0.3 >0.6
    x-【0.2*(x-0.3)】/(x-0.4)-0.3>0.6
    (2x+1)/(x-2)>=1
    x(x-4) >0
    -2{x}^{2}+x-6<0
    (2m-1)^2-4*1*(2m^2-1)
    (9000-0.466*x)/(49.5*x)=0.038
    sqrt(3*x+5)>x-2
    (a-1)^2<4
    2(x+1)(x+1)<7
    5/18v+1/125v2-15=0
    2/a >(-a+sqrt(a^2+9))/2
    2/a>(-a+sqrt(a^2+9))2
    x^3+2x^2+16x>30
    12x>5
    (1+2k)/k>0
    2k+1>0
    (x+3)*(x^2-4)<0
    2+(x+1)(x-2)>8

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