(x/6+x/8)-x/10=x
    x^3-4x^2-x+4=0
    x^3-4x^2-x-10=0
    x^3-4x^2-x-10
    (x+5)^x
    （x+5）^x
    x^2+5500x-360000
    -x^2-5500x+3600
    x^2-5500x+3600
    x^2-11000x+3600
    x^2-11000x-3600
    （12827*0.0398+x）/（12827-x）=0.1
    （EBIT-180）*（1-25%）/（1000+500）=（EBIT-180-（4000*8%）*（1-25%）/1000
    4x²-760x+23400=0
    (x-55)(540-4x)=6300
    x*0.2=190000
    3x²+16x+15=0
    4（500-20x）（20+x）=39520
    5x^2-19x-24
    5x^2-19x-24=0

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