(x-29.5)/x=80%
    x^3+4*x^2+5*x+3=0
    2X^2-5X-25=0 X>=0,X=
    2X^2-6X-36=0 X>0,X=
    2X^2-6X-36
    2X^2-6X-36
    2X^2-5X-25=0 X>=0,X=
    ((x-2)/(x+2))-1=8/(x^2-4)
    （5-111y）（1+y）^40-5（1+y）+105y=0
    (x-41.3)/x=10%
    (x-39.6)/x=20%
    106（1+y）^40+5（1+y）-105y=0
    (x-42.84)/x=10%
    (x-42.84)/x=10%
    (x-42.84)/x=10%
    (x-42.84)/x=10%
    (x-53.81)/x=10%
    (x-21.27)/x=50%
    (x-40.15)/x=10%
    (x-43.15)/x=10%

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