0.2264339*x^(5/3)+6.1125*x=921600
    150（1-X)=140
    （3/2）*x=4/x^2
    (x-4)^2+5=30
    58000＝（50-25）×x-50000
    58000＝（50-25）×3600-x
    (x/46063024.68)^(1/3)-1=0.2
    （92815*20）*((1+x)^-20) = （100000*((1+x)^10-1)/x）*（1+x）^15
    x²-4sqrt(2)x+16
    100X-（x*0.13-5）*0.12*100-（580+40*100）=0
    2n^2-7978n=-7956060
    m^2-3998m=3996000
    10/x=10/2x+15/60
    10/v=10/2v+15/60
    x/5+4=x/4-5
    （400-x）*（8+4x）=0
    （400-x）x（8+4x）=0
    -10x^2-300x＝0
     x/11.3=125880-x
    240x^2+180x+45＝195

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