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    -45.84x-arctan(x)=-180
    -45.84x-arctanx=-180
    -2(4x+3)^(-2)+2(4x-3)^(-2)+1÷2=0
    lnx=10
    3x^2+4x-4=0
    x^2=(0.001-x)1.8*10^-5
    x^2-2x-1=0,3x^2-6x+2020
    3x^2-6x+2020
    (0.36-x)²(0.64-x)=1.2×10^-12
    3x2-6x+2020
    (1-4/5)x+26=(1-3/7)x
    lnx=53.46
    6/(1+i)+6/(1+i)^2+6/(1+i)^3+6/(1+i)^4+6/(1+i)^5+100/(1+i)^5=95
    x/tanx=1
    x^2+10x+17=0
    0x=1
    2612476000=13.8*1580x*(1300-x/2)
    2612476000=13.8*1580x*(1400-x/2)
    13.4295x^2-17.8013x+2.880455
    4.5x=3

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