3-x=9
    4686=V+0.0305V+560+28+22.4+264.76+91.56
    V=231.75+0+6.95+0.01V+10.23+0.0002V+12.45+0.0005V+0.0529V
    （x＋9.6）*5/8-（9.6-8.4）*5/8＝9.6*0.25
    （x＋9.6）÷8*5-（9.6-8.4）÷8*3＝9.6*0.25
    V=191+0+5.73+0.01V+8.43+0.0002V+10.26+0.0005V+0.0529V
    tan（x）/x=-1.4
    191×[（1+0.0435）-1]+（0+5.73+0.01V）×[（1+0.0435）^0.5-1]
    （x-30.99）/x=1%
    26.12/6×x^3+29.24×x^2-160.65×x-11.36
    （x-30.99）/x=10%
    38.44+116.76+275.02=33.22+61.79+181.83+x(74.34+13.07x)
    38.44+116.76+275.02=33.22+61.79+181.83+x(74.34+13.07x)
    （x-30.99）/x=5%
    （x-30.99）/x=45%
    （x-30.99）/x=40%
    (80*cos(x)-20)*tan(x)+(80*cos(x)-20)/tan(30)+20*tan(x)=15.746
    (80*cos(x)-20)*tan(x)+(80*cos(x)-20)/tan(30)+20*tan(x)=15.746
    (x-87.51)/x=10%
    x-(22703.76+x-1264.74-1500)*0.03-681.11=16659.15

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