5-x=2x-2
    x tan(x)=2
    arctanx＋arctan(1/x)=π
    （x-x/1.13*0.13+0.15）/6.79=0.895
    （x-x/1.13*0.13）/6.7=0.0015685
    (x-x/1.13*0.13)/6.89=0.013
    (x-x/1.13*0.13)/6.89=0.034
    95057.17=(x/1.13*0.13)-(x/1.09*0.09)
    (1-5000/X)*100=9.5
    12.07c=（3.5+c）×7.92
    12.07c=（3.3+c）×7.92
    x^5 - 2 sqrt(3) x^4 - 3 sqrt(2) x^4 + 6 sqrt(6) x^3 + 9 x^3 - 12 sqrt(3) x^2 - 11 sqrt(2) x^2 + 4 sqrt(6) x + 18 x - 6 sqrt(2) = 0
    (1-5200/X)*100=9.5
    (1-5200/X)*100=9.5%
    109900×d^3-60×d-192=0
    16xx-33x+1=0
    16x2-33x+1=0
    x=-3/5*1082-240
    -0.6x-240=-5/12x-500/12
    1/x+1/(x+1)+1/(x+2)=1/(x+10)

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