ex-2x=0
    （2-x）（150+300x）=450
    ex+2x=0
    X+X*10%=5511
    (x-57.57)/x=5%
    (x-57.57)/x=10%
    (x-49.91)/x=10%
    (x-48.91)/x=10%
    x×x+9x+14=0
    (x-32.62)/x=1%
    (x-31.3)/x=1%
    (x-51.65)/x=5%
    (x-34.43)/x=2%
    (x-51.65)/x=5%
    (x-34.43)/x=2%
    (x-56.35)/x=5%
    (x-51.65)/x=1%
    th(0.4997)
    (x-51.65)/x=10%
    x*x*x+4*x*x-8=0

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