10000/(1+x)+11000/((1+x)^2)+12000/((1+x)^3)+13310/((1+x)^4)=14641/(1+x)+16105/((1+x)^2)+17716/((1+x)^3)+19487/((1+x)^4)
    2x^3-2x-x^2-1=0
    -√3/3x^(2)+1<-2√3/x
    x^(2)-3x-4<0
    (20-x)/(640.59*x^0.4504-166.55)=(x-0.05)/166.55
    2/3×(1/3+x)=1/3
    6x^2+0.4x-1.7*10^-10=0
    4641*x^3+19028*x^2+29309*x+21639=0
    x-(x-20%)=60
    21.83(45-x)^0.75=46.29(x-34.5)
    9/q＋9q＝30
    x*x-2*x-5
    x^2+2x-4.94=0
    x^2+2x-7.0992=0
    x^2+2x-29.79=0
    x^2+2x-11.83=0
    x^2+2x-29.183=0
    (x-0.05)/166.5=(20-x)/(640.59*x^0.4504-166.5)
    (x-0.05)/166.5=(20-x)/(640.59*x^0.4504)
    x+7000-x*3%>=10000

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