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    900=80/(1+x)+80/(1+x)^2
    9.5+x=13
    900=80/(1+x)
    x^3-(0.3×10^(-3))x^2+(0.00875×10^(-6))x=0
    x^2+2x-47.4=0
    x^2+2x-76 =0
    (35/3)*π*(19*19+x*x+19*x)=35000
    (35/3)*π*(19*19+x^2+19*x)=35000
    35/3*3.14*(19*19+x^2+19*x)=35000
    35/3*3.14*(16*16+x^2+16*x)=35000
    x^2+2x-45.5=0
    2x^3+47*x^2+360*x+900=0
    x^2+2x-75.72=0
    sin(x)*cos(x)=e^x
    sinx*cosx=e^x
    sinx*cosx=ex
    1.7=x*(2.5*ln(x*0.03/1.006/10^6)+1.75)
    x^5-x^4+4x^2-6x+1=0
    2(x-1)-6(x-2)=3(1-x)
    x^4-8x^2+16=0

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