（X-5000-767.55）*0.03=X-60000
    （X-5000-767.55）*0.03=X-20000
    （X-5000-767.55）*0.03=X-20000-737.55
    （X-5000）*0.03=X-20000
    0=-12.7+1.43*x-0.0005*x^2
    0=-14.7+1.7245*x-0.0005*x^2
    0=-14.7+1.4313*x-0.000511*x^2
    0=-14.7+1.14313*x-0.0005*x^2
    0=-12.7+1.34313*x-0.0005*x^2
    0=-14.7+1.34313*x-0.0005*x^2
    0=18.38632+0.83389*x-0.000302019*x^2
    0=-11.32434+0.80069*x-0.000347445*x^2
    x^2-5/3*x-7/3=0
    x^2-5x+1=0
    0.43=0.137a^-3+0.119a^-2+0.269a^-1-0.019
    (20-x)(100+10x)=2160
    4x=6/2
    3x=15+6
    3x=15+6
    x=3-2

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