arctan(x)+arctan(2*x)=4/π
    90=arctan(x)+arctan(2*x)
    -4114150+3000000+x-450000-x*10%/4=3000000
    2/x+3-6/x-8=3/2x+1-1
    -4114150+300000+x-450000-x*10%/4=300000
    X*2.7%=1700000
    x = 0.15x+38613.72+445.05+0.0672x
     x = 0.15x+40041.72+457.19+0.0672x
    x=0.15x+40041.72+680.71+0.0672x
    x=15%x+40041.72+6.72%x+680.71
    x=15%x+40209.72+458.62+6.72%x
    x=15%x+40209.72+458.62+6.72%
    x=15%+40209.72+458.62+6.72%x
    x=40209+4858.62+0.067x+0.15x
    0.16*(18+x)*(18+x)/((13+x)*(13+x))=1.25
    8647=273560*i*(1+i)^36/((1+i)^36-1)
    8647=273560*i*(1+i)^36/(1+i)^36-1
    8647=273560*i*(1+i)36/(1+i)36-1
    5x+100
    lgx=15.5

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