(x-47.98)/x=10%
    (x-48.96)/x=10%
    (x-47.98)/x=10%
    (x-59.48)/x=20%
    (x-67.87)/x=3%
    (x-65.48)/x=5%
    (x-65.56)/x=3%
    (x-65.48)/x=10%
    (x-89.68)/x=10%
    (x-85.34)/x=10%
    (x-106.14)/x=10%
    p^2+1.058p=0.72
    x^2-80x-1600＝0
    lnx－x/e
    （2x）（2x）+（6-x)（6-x）=45
    24y^2-74y+5=0
    （100-2x）（50-2x）＝3600
    2x∧2＋5.2x－3.84
    2x∧2＋5.2x－3.84
    (x-88.88)/x=10%

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