0.75:x=3:4
    X*0.0038=X-54441.29
    X*0.38%=X-54441.29
    X*0.38%=54441.29
    1/470（0.021L^1.85+0.25*260*260）L^0.84=0.374/0.2
    3.29=（（0.021*x^1.85+380）^0.05）*x^0.84
    8:28=5:x
    x:28=5:8
    x^x=2^2048
    1.8x-x²＝7.2
    0.45*11*a+（0.45+0.36）/2*11*（8-a）＝34.98
    2x + 3 = 7
    （260*63-X）*0.95=12964.15
    x+sqrt(8-x^2)=sqrt(16-x^2)
    （3.2-0.8）*x=3.2*x-0.8*x
    610/1235=X/（0.1+X）
    610/1235=X/1.1X
    5x-26=432
    （x＋15）（35＋3x）＝1000
    ((4/7)*x*(2/5))/(1/14)-60

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