X=20*(0.123*4*((10/6.8)^0.85)*0.1^0.75+0.123*4*((30/6.8)^0.85)*0.1^0.75)*0.2
    X=70*(0.123*4*((10/6.8)^0.85)*0.1^0.75+0.123*4*((30/6.8)^0.85)*0.1^0.75)*0.2
    X=70*(0.123*4*((10/6.8)^0.85)*0.1^0.75+0.123*4*((30/6.8)^0.85)*0.1^0.75)
    -2x^3-18x^2+202x-310=0
    x-（5x÷20）＝9
    x-（5x÷9）＝1.2
    x*x*x/9-25*x*x+1400*x+684=0
    X^3/9-25X^2+1400X+684=0
    X^3/9-25X^2+1400X+648=0
    x*x+x=240
    x+x/1.13*0.1=193
    x+x/1.13*0.1=330
    x+x/1.13*0.1=270
    x+x/1.13*0.1=270
    （x-1600-900)/10000=(x-1600)/12000
    （x-1600-900)/1000=(x-1600)/12000
    （x-1600-900）/10000=（x-1600）/12000
    （x-1600-900）/10000=（x-1600）/12000
    （x-1600-900）/10000=（x-1600）/12000
    （x-1600-900）/10000=（x-1600）/12000

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