Mathematics
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    600x-x^2=(400-x)^2
     xln(16.67x) = 0.149
     xln(16.67x) = 0.02644
     xln(6.2893x) = 0.02644
     xln(6.29x) = 0.02644
     xln6.29x = 0.0265
     xln6.29x = 0.02644
     xln6.2893x = 0.02644
     xln6.2893x = 0.034264
    xln6.2893x=0.034264
    6x/7+x/5=x+18
    x^2 + 5x + 6 = 0
    x^2-75x+1350=0
    x^2-75x-1350=0
    lnx-1/x
    (1.22-X)/230=(1.48-X)/306
    (1-x^2)=3(3x-2)^2
    (1-x^2)(x+1/2)^2=3(3x^2-1/2x-1)^2
    10000/70*(x+66)+500/70*x=27600
    sin(60-x)=2sinx

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