x^2-4x-1=0
    x*x+6x+36=0
    0.00879-0.92394*x^-0.0815+7-7.90712*x^-0.0196=0
    x+x*0.13=3198
    3a^4+20a^3-719a^2+7620a=21900
    4x＾4-8x＾3+15x＾2-16x+8=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.82166397969319)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.22123378250016)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.71875521879131)
    2000000＝100×80000-20×80000-5×80000-x
    2000000＝100×80000-20×80000-5×50000-x
    6000x－2000x－200x－10000000＝50000000
    X/(1-X)=10%
    x+（（√5-1）/2）x=1
    x×（x+16）
    0.507/(40/Q+8.5)=0.493/(50/Q+6.8)
    0.493/(50/Q+6.8)=0.507/(40/Q+8.5)
    0.493/(50/Q)=0.507/(40/Q)
    1+Q=0
    1-x=2x/√5-1

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