16x^2+385x+825=
    450/x-450/x+5=1
    t^2-8t-44=0
    t2-8t-44=0
    7a^4-359a^3+6844a^2-56280a+176400=0
    7a^4-359a^3+6844a^2-56280a+176400=0
    7a^4-326a^3 +2339a^2-51527a+176400=0
    sprt(7%*(1-7%)*15%)=
    3x+5=95
    0.108=0.8*（1+x）/10+x
    0.108=0.8*（1+x）/10+x
    （x-200000）/x=0.2
    (1+3%)*(1+x)=(1+8%)^2
    (1+3%)*(1+x)=(1+8%)^2
    0.108=0.8*（1+x）/10+x
    2/X
    x^2-9x-17.98=0
    1.8x^2+0.3x-220=0
    1/2m×m-4m＝6
    x+0.01x=37781.4

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