x^3-9x+2
    x^3-9x+2
    x+x*0.06=3411
    （x*60-150-20)*0.75/40=0
    （x*40-120-20）*0.75/20=0
    1/d+1/(d+1)+1/(d+2)=0
    1/d+1/(d+2)=1/(d+3)
    1/d+1/(d+2)+1/(d+3)
    5x²＋x－500＝0
    (28236.6-x)*0.09=x
    2x^3+5x^2=-1
    2s^3+12s^2+17s+5=0
    400/(1+a)+300/(1+a)^2+300/(1+a)^3
    854+0.21*t-0.61*t-0.00015^2=0.318*t-0.318*120+0.00015*t^2-0.00015*120*t
    701.3=x*30-50
    （e^（-x）-e^x）/2-x=0
    （e^（-x）+e^x）/2-x=0
    arctanx-x=0
    x5−15x4+85x3−225x2+274x−121
    15x^2-1860x-60000=0

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