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    1/(x-4)+1/x=0
    arctan2x-arctan8x=-π/2
    (x-20)(540-10x)=2400
    arctan2x-arctan8x=-90
    a×4+(a+3)×2-(a+3+a)×2=16
    arctan2x+arctan8x=180-π/2
    a×4+(a+3)×2-(a+3)×2=16
    arctan2x+arctan8x=180-π/2
    (x-20)(540-10x)=2400
    6a+6-(2a+6)=16
    arctan2x+arctan8x=180
    (x+6)20=(x+6+x)12
    e^x-sin(x)-4=0
    x^3-2*x-2=0
    x+1/x-2
    x^2-1=2(x+1)
     X/(100+X) = 50%
    x/(x+100)=99%
    x/(x+100)=100%
    x*(x+100)=100%

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