2.7*0.6029*500000/200000/x*(1.9*40+0.08*25*400*400/x)=0.2
    2.7*0.6029*500000/(200000*x)*(1.9*40+0.08*25*400*400/x)=0.2
    0.0184*x^2-0.0831*x+1.4246=1.4212
    -0.0614*x^2+0.0895*x+1.3304=1.364
    -0.0614*x^2+0.0895*x+1.3304=1.363
    -0.0614*x^2+0.0895*x+1.3304=1.365
    -0.0614*x^2+0.0895*x+1.3304=1.3665
    2.7*0.6029*500000/(200000*x)*(1.9*40+0.08*25*x/400/400)=0.2
    -0.0614*x^2+0.0895*x+1.3304=1.3670
    -0.0614*x^2+0.0895*x+1.3304=1.3674
    -0.0614*x^2+0.0895*x+1.3304=1.3675
    -0.0614*x^2+0.0895*x+1.3304=1.3613
    -0.0614*x^2+0.895*x+1.3304=1.3605
    -0.0614*x^2+0.895*x+1.3304=1.3613
    0.0184*x^2-0.0831*x+1.4246=1.4287
    0.0184*x^2-0.0831*x+1.4246=1.4225
    0.0184*x^2-0.0831*x+1.4246=1.4287
    x*x+34x=828
    x*x+34x=828
    x^2=1

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