x^-207x+10440=0
    2/x-2x=0
    0=-2*1/3+b
    x
    xcosx=sinx
    x=tanx
    3x-5x*cosx+2sinx=0
    3x-5xcosx+2sinx=0
    e^x(-3x+1)(x-1)+1=0
    0.6/0.99=(1+0.01*x)/(1+49*x)
    0.6/0.99=(1+0.000001*x)/(1+49*x)
    0.6*x=1+393939.393939*0.0.0004
    0.6*x=1+393939.393939*0.0.0001
    0.6*x=1+393939.393939*0.0.0049
    0.6*x=1+260.171713*0.0025
    0.6/0.99=(1+0.000001*x)/(1+0.0.0004*x)
    940*(1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9)=8699934
    0.6/0.99=(1+0.000001*x)/(1+0.0.0001*x)
    0.6/0.99=(1+0.000001*x)/(1+0.0.0049*x)
    0.507*（（90/x）+15）/（40/x）+8.5=0.493*（（90/x）+15）/（50/x）+6.5

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