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    x*(1+x)^6 = 5(1+x)^6-5
    x*(1+x)^6=5(1+x)^6-5
    x*(1+x)^6=5(1+x)^-5
    x²-x-1=0
    a^2+a*7—17750=0
    750x/1+x +30x
    (1+(2.78*(x+20))/(x+1420))/1+(2.78*x)/(x+1400)=1.12
    (1+(2.78*(x+20))/(x+1420))/1+(2.78*x)/(x+1400)=1.12
    (1+(2.78*(x+20))/(x+1420))/1+(2.78*x)/(x+1400)
    1+(2.78*(x+20))/(x+1420)
    (x+260)*0.7-80=x
    (x+260)*0.7-x=80
    (x+260)*70%-x=80
    9xx+28x=180
    X/87-(80-X)/500-.02=0.131
    max[3,(1-0.8)×18]
    (3+max[3,(1-0.8)×18])
    (3+max[3,(1-0.8)×18])
    X×X-14.5X+25=0
    186000/x+2x-50000/x=12

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