124-68+X=-52
    arctan((20+50)/x)+arctan(20/x)=98.5
    arctan((20+20)/x)+arctan(20/x)=59.8
    72+5-X=9
    arctan((20+20)/x)+arctan(20/x)=59.8
    arctan(4/x) = 17.146
    arctan(4/x) = 12.46
    arctan(4/x) = 12.46
    arctan(4/x) = 12.46
    arctan(4/x) = 12.46
    arctan(4/x) = 12.76
    arctan(4/x) = 12.76
    arctan(4/x)=13.1
    arctan(4/x)=12
    arctan(54/x)+arctan(20/x)=120
    arctan(54/x)+arctan(20/x)=60
    74x=((54*54+x^2)*(400+x^2))^0.5
    293.6T+7.77T×lnT-133284.54=0
    (x+1)*cosx-1=0
    x^8=4^x

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