64209.76-0.0003X+(X-0.0003X)*25%=X
    x=(1-x)^2.47
    8.314*523*(0.5-x)*(0.6-x)=27.3*200*(0.2+x)
    8.314*523*(0.5-0.020928)*(0.6-0.020928)=x*200*(0.2+0.020928)
    8.314*523*(0.5-x)*(0.6-x)=27.3*200*(0.2+x)
    8.314*523*(0.5-x)*(0.6-x)/200*(0.2+x)=27.3
    8.314*523*(0.5-x)*(0.6-x)/200*(0.2+x)
    X*(1-20%)*20%-2000=X-20000
    tan9PI/sin3PI
    X*(1-20%)*30%-2000=X-20000
    2s^3+20s^2+50s+30
    3²+1=v
    5c-1=29
    2.47x=(1＋1.47x)*(4.33x-1.33)
    x²-6x-98=0
    xsin(x(-1))
    64183.46+X*0.25=X
    64183.46-X*0.0003+(X-X*0.0003)*0.25=X
    96142.31-X*0.0003-(X-X*0.0003)*0.25=X
    2.13sinx+0.835sin2x=1

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