(50+x):(50-x)=0.|3:0.25
    (50+x):(50-x)=(1/3):(1/4)
    x^2=4 x^2=5 x^2=6 x^2=7
    sin x=-0.279
    sinx =34.57
    x+x+x+x+180481=1028 7891*x=18
    0.|3+0.|5+x=1
    10x+6*(800-x)=6000
    6.5=5x+2.5
    6.3=4.5x+2.3
    6.5=4.5x+2.3
    ln（0.4613/0.0109）=-30990/8.314*（1/x-1/298.15）
    x/［（1-0.5*x）^2*3^1.5］=5.98*10^-4
    x+33+95=157
    4.0746=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    x^2+5sqrt(3)x-6=0
    (t^2-1)sint/2=0
    （3x+1)×(x+2)
    （3x+1)×(x+2）
    （√5+2）^x+（√5-2)^x =18

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