x-318.94-（x-318.94-5000）*3%=6300
    100/44=x/3.34
    20/2=1/x
    20/5=1/x
    x-718.94-（x-718.94-5000）*3%=8000
    q^3-15q^2+50q
    -(2/k) = 3/(k-√3)
    x-318.94-（x-318.94-5000）*3%=6500
    (2/k) = 3/(k-√3)
    -(2/k) = 3/(k-√3)
    x-963.85-（x-963.85-5000）*3%=6500
    （x+4）²=13
    -(2/k) = 3/(k-√3)
    -(2/k)=3/(k-√3)
    -(2/k)=3/(k-√3)
    (-2)k=1
    -2/k=3/k-√3
    14400=150*x*8
    a^2-4*a+4=0
    14400=150*x*8

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