Mathematics
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    (x²-1)/(2x²+1)-1/2<1
    -1/m≥2
    x^2-25x+100≥0
    60/x+40/x-40≤4
    60/x+40/x-40≤4
    x^2-65x+600≥0
    m<2 m+2>2 m^2-4m-4>=(m+2)^2-4(m+2)-4
    (x+1)(x+2)(x+3)>26x-2
    (x-25)(80000-2000(x-25))>=25*80000
    a-1<6<2a+4
    a-1<-2<2a+4
    x*x-4x-12<=0
    40-2x<=16
    20-3x<12
    x²-x>0
    (1-y)^2-4(y-2)(y-1)>0
    X^3-19.21X-39.76>=0
    100*1.04*X>100*0.4*1.04*X+100*0.8
    x/(1+6.5%)>x-x*(1-20%)*20%
    x/(1+6.5%)

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