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    100+24/(1+x)-10.08/(1+x)^2-5.7/(1+x)^3=0
    X^2 -x-48=0
    X+1/X=4
    4.191=(24.1*0.449*(x+0.1))/(1+0.449(x+0.1))*(100-9.66-1.06)/100*1/(1+0.31*1.06)+(2.86(x+0.1))/(1.36*0.101325)
    3.8899=(24.1*0.449*(x+0.1))/(1+0.449(x+0.1))*(100-9.66-1.06)/100*1/(1+0.31*1.06)+(2.86(x+0.1))/(1.36*0.101325)
    [20*(x+30)]/60=40x/80
    (160+2x)*(120-x)=20000
    25%=X÷2.6676*100%
    25%=X/2.6676*100%
    x+3/x+2
    25 t^2-64 t+48=0
    x^2-4x+3
    e^x(lnx)
    49.76*(1/x-1/(x+0.8))=36
    p^2-p+1/16=0
    -x+1/x
    1+a^2+a=1024
    18x-4x²=4.25
    19x-4x²=4.25
    20x²-72x+17=0

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