0.666667/x+x=1
    0.666667/x+0.666667/x=1
    8（2y-1）=（y^3+1）^3
    8（2y-1）=（y^3+1）^3
    2（2y-1）^1/3=y^3+1
    2x-3x=0
    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

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