（EBIT-180）*(1-25%)/1500=(EBIT-180-4000*8%)/1000
    6889/x=83
    9x+2=83
    （5500+x）/【3/（22000+x）】=1.5
    44000+x/33000+15x=3
    44000+x/33000*15x=3
    ln(1+x)/(1-x)
    3x^2+20x+24=0
    3x^2+12x+25=0
    0.52x^2-0.6x^3-21x+58=0
    13*x^2/9+4*x/3-21/4=0
    0.6x^3-0.52x^2+21x-58=0
    106×7.93+12.18x=（106+x）×7.965
    104×7.93+12.18x=（104+x）×7.97
    x^3+5x^2+10x+12=0
    3x^2+10x+4=0
    3.5x^2-12x-5.5=0
    3.5x^-12x-5.5=0
    3.5x^2-11x-5.5=0
    0=-8（0.5+a）+28

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