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    -arctan(0.1475x)-arctan(0.0731x)=-130
    -arctan(0.1475x)-arctan(0.0731x)=-140
    -arctan(0.1475x)-arctan(0.0731x)=-150
    -arctan(0.1475x)-arctan(0.0731x)=-5π/6
    -arctan(0.1475x)-arctan(0.0731x)=-7π/9
    -arctan(0.1475x)-arctan(0.0731x)=-13π/18
    -arctan(0.1475x)-arctan(0.0731x)=-2π/3
    -arctan(0.1475x)-arctan(0.0731x)=-11π/18
    -arctan(0.1475x)-arctan(0.0731x)=-5π/9
    -arctan(0.1475x)-arctan(0.0731x)=-100
    x∧(2)/0.05-x=1.75×10∧(-5)
    (12-y)(300+50y)=4000
    225*(x+1)^2=324
    x乘x-5x+1=0
    8C2
    1.12x=358240.76
    x^(5-x)=1
    (77059-2.5X)*10.8/21.8*0.9=18356+9X
    13x^2-36x-124=0
    (X-6)/2022+(X-5)/2023+(X-4)/2024=3

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