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
    x+14/1.6-1.5x/1.6=21
    (x+1)(x十2)(x+3)(x十4)十1=0

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