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    (1-0.2k)*(e^(-5))-k*e^(-5)+0.2k=1
    1-(1-0.2k)*(-1-e^(-5))-1.4*k+(1-0.2k)*e^(-5)-k*e^(-5)+0.2k=0
    1+(1-0.2k)*(-1-e^(-5))+1.4*k+(1-0.2k)*e^(-5)-k*e^(-5)+0.2k=0
    (x-3)/2-(2x➕1)/3=1
    11600*0.9+0.9*X=8200+X
    13800×0.9+0.9X=9800+X
    2x(29+2x)+44x=159.5
    k*e^(-1*k)=2
    lnk-k=ln2
    x^2+8^2 = (20 - x)^2+14^2
    3.5*x^2+1.47*x-0.19644=0
    x²-2x-3
    3.1288=((18.92*0.76(x+0.1))/(1+0.76(x+0.1))*((100-18.25-1.35)/100)*(1/(1+0.31*1.35)+((2(x+0.1))/(1.47*0.101325))
    1.45x=1.9(x-117)
    500(1+x)(1.08+x)=112
    x^4-4x^3+2x^2+3x
    0.9=e^5×k
    37=47e^k
    (2253.34-x-6139.93)/6139.93=(2613.09+x-3716.13)/3716.13
    2*8x=8

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