x+x^3=1
    x*x-2x+1=0
    0=-940+547/(1+x)+817/(1+x)^2+1141/(1+x)^3+1438/(1+x)^4+1652/(1+x)^5
    518647500x*x-2.31x*35775+5.3361=0
    0=-400+62/(1+x)+125/(1+x)^2+201/(1+x)^3+329/(1+x)^4+379/(1+x)^5
    5500-5000-9×（x-210）-5×（x-200）＝0
    5500=5000+（x-210）*9+(x-200)*5
    X-25=82
    0.1*x^3-2*x^2+15*x=45
    (2x+1)(3x+2)>12
    40^2/25^2
    x-2<3x-6
    10^2/25^2
    xx-x-992=0
    x-e^3x+5=0
    (5*x+1.5*x)^3=22.959*(5+3*x)
    0=-2.4*10^(-11)*x^3+4.81*10^(-7)*x^2-3.36*10^(-3)*x+9.4;
    0=-2.4*10^(-11)*x^3+4.814048*10^(-7)*x^2-3.362582*10^(-3)*x+9.4017;
    X^2+5X+5=0
    (0.00001-x)(0.00001-x)(0.00001+x) = 2x*12.5*10^-12

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