(20-x)*0.2=x
    3/(x*sqrt(x^2+1)*sqrt(1+0.25x^2))=1
    100+(24/25)x^2-x^3=0
    s^2+24s+100=0
    x(x^2+24x+100)=(x+25)(3x^2+48x+100)
    （0.1-x）(1-x)/x=1.75*10^(-5)
    6（x－10）＋15＝2（x＋5）＋25
    sin(18.19635x)=14.87025x
    sin(18.19635x)=15.3766x
    sin(18.19635x)=16.09365x
    sin(18.19635x)=16.3404x
    sin(18.19635x)=16.5025x
    sin(18.19635x)=16.8214x
    sin(18.19635x)=17.14945x
    sin(18.19635x)=17.34465x
    sin(18.19635x)=17.56895x
    20+2000/x-90x-8000/[(x-1)x]
    x+1/x+16/x^2+1
    （25.851+x）×0.85＝51.702+67.353-x
    （25.851+x）×0.85＝51.702+68.353-x

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