0.997X+0.003x=969.08
    x-500/x/0.13=2.5
    x/0.13×2.5=x-500
    (3.3-0.7＋0.6×sqrt(2.4×x))/(1＋sqrt(2.4×x))＝1.4
    0.007309926x^2+0.646709778x -0.241589556
    (4×x^2)/(2-x^2)=55.3
    150×(3.3-1.23×x-1.37-0.7)^2=240×(2×(1.23×x＋1.37-0.6)×x-x^2)
     x^2+0.052x-0.10044=0
    150×(2×(3.3-0.77×x＋1.17-0.7)×(3.3-x)-(3.3-x)^2)＝240×(0.77×x-1.17-0.6)^2
    x/(1-x)
    x+1/x（x+2）
    0.06x+x=546800
    sin 1/x
    0.01x+x=568000
    x^5+10x^3+20x-4
    4*（e^(x/4)-1)=0.1
    52*（e^(x/52)-1)=0.1
    1*（e^x-1)=0.1
    ln1.0103812891=x
    (x*2)*0.75=69

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