x + 1 = x - 1
    x^5-15*x^4+85x^3-225*x^2+274x-121
    0.8x＝208
    8x
    11x + 5 = 26 + 13x - 21 - 2
    6x + 14 + x = 26 + 7x - 12
    2x + 5 - 10x + 11 = 0
    5x + 4 = 7x + 2 - 2x
    2x + 1 = 4
    227.76=0.105*X+X
    227.76=0.105/X+X
    227.76-X=0.105/X
    4x=1-1/（1+x）^5
    （227.76-X）/ X=10.5%
    （227.76-X）* X=10.5%
    x:(5.4-x)=5:4
    x/4-2=16
    x%4-2=16
    48-x/x = x / 48
    48-x/48 = x * x / 1

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