x^3+20.93x^2+0.4x-0.14=0
    2/x+1/（x+9）=1/（x+5）
    xln（x/0.034）=0.0659
    xln（x/0.034）=0.0598
    (10x+3)*6528=(30+x)*8256
    (x-887)/4.0979=x^(2/3)
    (x-887)/4.098=x^(2/3)
    x-887=4.098*x^(2/3)
    x-7236=3*x^(2/3)
    x^3-20x^2-4775x-356250=0
    3x^3 + 24x^2 + 54x + 48 = 0
    X^2-2X-3=0
    (x-x/1.09*0.03)*0.02=77467.52
    x（x+1）+2x
    (x+1)*(e^x)*(1.819*10^(-12))=(1.819*10^(-12)+0.095
    (x+1)*(e^x)*0.01819 = 0.095+0.01819
    (1+x)*0.01819*ex = 0.095
    (1+x)*0.01819*((e^x)-1) = 0.095
    （8-a）（200十50a）=1750
    d^2+d-11=0

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