x^3-3x^2+2x-1=0
    x^3-3x^2-2x-1=0
    x*x*x*x*x-15*x*x*x*x+85*x*x*x-225*x*x+274*x-121
    x^3-3x^2-2x+1=0
    2x + 1 = 5x + 1
    x + 2 = 2 + x
    （x+3）（2x+5）-x（3x-1）=15
    x + 1 = 1
    4x - 15 = x
    2x - 4 = 20
    x + x2 = 84
    x + 2x = 84
    84 - x = 2 ( 84 - x)
    x + x + 2 = 84
    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

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