(180x)^2+324=(100x^4-604x^2)^2+(6x-401x^3)^2
    16*x*x*x-8*x*x+x-9=0
    16*x*x*x-8*x*x+x-9=0
    2*（7-x）+3x=19
    logx=-1.15
    1/(√x²+1)=0
    1/(√x²+1)=0
    1/√x²+1=0
    (7.2x)^2+324=(0.125x^4-4.75x^2)^2+(6x-1.5x^3)^2
    x/30+0.25=x/18-0.25
    (6-1.5x^2)^2+(4.75x-0.125x^3)^2=(7.2x)^2+324
    3+X＝9－X
    x^4+4x^2-288=0
    2－3（X＋1）＝0
    3x^4+18x^3+35x^2+28x+12
    X＋4＝2X－4
    4x+4*7/12*x=760
    7x/2-9=8/x
    2－1/3M＋1/3＝2
    x^6+4x^4+36x^2-324=0

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