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    x/(x^2+4)^3/2
    arctanx+arctan5x=60
    x/(x²+4)^(3/2)
    x/20+x/30+x/42=3
    x
    70*10^6=23*250x(565-x÷2)
    70*10^6=26*250x(565-x÷2)
    70*70^6=23*250*x(565-x/2)
    x=5/4÷2
    2x+x=5/3
    3x=3/5
    x-1/lnx
    (1.3621-0.00406V)60=(30%V-28)+20
    50=x+2080/(578X)
    50=x+2080/578X
    578x+2080/(578x)=28900
    578x+2080/578x=28900
    (578x)^2+2080x=28900
    x+27=4x+3
    4-3(100-X)^2/1600

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