(50+x)/5*0.66=x
    58x=(1.3+x)^3
    250+5x=x÷0.66
    4800/x^3+6*1650/4/x^3<=10^7
    a^2-3a+3=0
    3000*0.075*12/0.1/0.15^3
    625*0.05*12/0.15/0.001
    x/x-1=√3
    25000/0.15/0.1
    (x-0.37)(x-0.34)-0.1089=0
    4*15/3.1415926/x^2+32*0.4*15/3.1415926/x^3<=35*1000
    x^2-0.71x-0.2042=0
    262.74×16.1+496.33×11.1+485.27×4.16+254.42×1.88+426.6×0.63-1.38×17.26-990.62×10.49-629.49×4.4-159.18×1.89-145×0.63=
    x+（50-x）=50
    x-5/2+1>x-3
    （5600-1800）*g-5000*（1+g）*8%*（1-50%）=0
    2.8x+1.7(1-x)=50
    262.74+496.33+485.27+254.42+18.15t^2+304.56t=1.38+990.62+629.49+159.18+6.6t^2+102.96t
    -5/(x^2)-5/x+1=0
    5/(x^2)+5/x+1=0

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