0.25(1000+x)=0.212×1000+1.121x
    10sqrt(1+(0.1x)^2)/(x*sqrt(1+x^2))=1
    x*13+（320-x）*3%=320*9%
    lnx=(x-1)*ln5/4
    （26.253+x）×0.85＝52.306+67.359-x
    （26.253+x）×0.85＝52.306+68.359-x
    （26.253+x）×0.85＝52.306+69.359-x
    （26.253+x）×0.85＝52.306+70.359-x
    （26.253+x）×0.85＝52.306+71.359-x
    （26.253+x）×0.85＝52.306+72.359-x
    x÷0.91*1.23*0.9=51.99
    x÷0.91*1.23*0.9=60.99
    x÷0.91*1.23*0.9=61.59
    x÷0.91*1.23*0.9=90.25
    x÷0.91*1.23*0.9=52.5
    (X-0.985)/X=0.387
    2x-1=0.6(3x+4)
    30.1=0.7143x^2+68.23x-9.286
    0.0005933×x²-0.0034277×x+2.000935=0
    x+36/x

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