X-5/9X-4=2/5X+6
    X-5/9X-4=2/5X+6
    0.3x^2-4x+15=55
    -3x^3+16x^2-28x＝200
    21x-4(2x-0.3)=5.1
    x^3.2=369
    (0.670738561^x)-x*(-0.70309448)-1=0
    0.670738561^x+x*0.70309448-1=0
    √z^3+√z=0
    z^3+z=0
    （√z^3-√z）^2=2
    arctan20.16x-arctan0.5x-arctanx-arctan177.408x=-90
    0.670738561^x-x*15.60642341-1=0
    e^z-z=-ln(π/2)
    （42.309+x）×0.85＝76.418-x＋42.309
    （42.309+x）×0.85＝77.418-x＋42.309
    （42.309+x）×0.85＝78.418-x＋42.309
    （42.309+x）×0.85＝79.418-x＋42.309
    （10%-x）/5=496.66/635.96
    （10%-x）/（10%-15%）=（496.66-0）/（496.66-139.31）

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