6*10^24*(384400-a)^2=7*10^22
    6*10^24*(384400-x)^2=7*10^22
    2x（2-2x）＝0.00658*300（0.23-x）^1/2（0.69-3x）^3/2
    (x+1)^2-2*(x+1)+3
    arctan2+arctan(2/x)=90
    (x+1)ln(x^2)-x=1
    x-3%x=6500
    x*x*x+8*x*x+18x+16
    s^2=5
    x3
    s^2=-5
    3s^2+12s+5=0
    x−x×3%
    x-(x-5000)*3%=12000
    125t^2-150t-4400=0
    (x+1)ln(x^2)-sinx=2
    (x+1)ln(x^2)-x=2
    (x+1)lnx^2-x=2
    (x+1)lnx^2-3x=2
    (x+1)lnx^2-3x=1

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