0.8w+arctanw=-180
    0.8w+arctanw=-π
    0.8w+arctanw=π
    0.8w+arctanw=180
    4.32*（25-x）+216.2=（6.48*x+192+50）/1.5
    4.32*（25-x）+259.4=（6.48*x+192+50）/1.5
    2*x*e^x+lnx=0
    2x^3+3x^2-1=0
    4.32*（25-x）+174=（6.48*x+61+50）/1.5
    283201980*12x+12=172
    625t^6-75t^4+0.12=0
    20×(63-x)+25x=1415
    20×(63-x)+25x=1415
    x^3+16.5x^2+30x+10=0
    2x^3+33x^2+60x+20=0
    x^3+2x^2+3x=0
    x^4-18x^2-63=0
    x^2-18x-63=0
    2000（1+x）²=3380
    x^4-18x^2-63=0

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