w^2-43.5w+45.5=0
    x^2+160x=86892.25
    1/d+1/(d+2)+1/(d+3)=1/(d+5)
    d^3+10d^2+25d+15=0
    7.5828=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    arctan5x-arctan5=-7.12
    arctan5x-arctan5=-7
    arctan5x-arctan5+52=45
    （26.127+x）×2.55＝52.254+69.681-x
    （26.127+x）×2.35＝52.254+69.681-x
    （26.127+x）×2.15＝52.254+69.681-x
    （26.127+x）×1.95＝52.254+69.681-x
    （26.127+x）×1.75＝52.254+69.681-x
    （26.127+x）×1.55＝52.254+69.681-x
    （26.127+x）×1.55＝52.254+69.681-x
    x-2.47*100000000000/x^2=21321.43
    159.5666=26.58333*（2.8-x）+95.4802
    x-300=2.8554*x^(2/3)
    x-290=1.4118*x^(2/3)
    (26.127+x)×2.55＝52.254+69.181-x

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