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
    (2.4*(0.6X+670)/(X+670)+1.35*1.3*(1.3X+670)/(X+670))*2.32=(2.52*(0.3X+670)/(X+670)+1.35*1.3)*2.4*1.2
    (2.4*(0.6X+670)/(X+670)+1.35*1.5*(1.3X+670)/(X+670))*2.32=(2.52*(0.3X+670)/(X+670)+1.35*1.5)*2.4*1.2
    2.4*670/(X+670)=1.35

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