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    arctan(2x)-arctan(0.1x)-arctan(0.2x)-arctan(26x)=-90
    10000/(125.64+x)+20000/(185.64+x)=150
    10000/(125.64+x)+7800/(185.64+x)+10000/(185.64+x)=150
    (125.64+x/10000)+(185.64+x/7800)+(185.64+x/10000)=150
    (10000/125.64+x)+(7800/185.64+x)+(10000/185.64+x)=150
    4/x-9/(1-x)=0
    10000/(125.64+x)+20000/(185.64+x)=150
    2150000000=13.8*1600x*(1176-x/2)
    (x+30)/x=1.25
    x^4-2x^3+3x^2-2x+1=0
    A*0.5A-A=24
    (X➕50)➗X=1.6293
    29.25*(1-q^16)/(1-q)=3782.6
    29.25*(1-q^16)/(1-q)=3782
    29.25*(1-q^16)/(1-q)=3782
    29.25*(1-q^10)/(1-q)=3782
    (1-q^10)/(1-q)=20
    (1-q^10)/(1-q)=10
    A=29498400+134640+A*0.0015+A*0.06+0.0072*A
    9250=340/(10%-x)

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