4x^3=0.125*(2-3x+x^3)
    235x/(235x+238*(2.0959-x)) = 70%
    235x/(235x+(2.0959-x))=70%
    3+2x=15
    1=((6+3^(1/2))/5)*x^2
    x^2+120x-2025=0
    73219.35=(10000000*x*(1+x)^60)/((1+x)^60-1)
    73219.35=10000000*x*(1+x)^60
    x^2+115x-2400=0
    125(1-x)^3-30(1-x)+4=0
    (7148497.50+X)*0.2/1.05*0.05=X
    13994.2062=22400*2.25x（1.5618-x/2）
    (7148497.5+x)*0.2/1.05*0.05
    1.4x3十0.7X=5.6
    x^((x+2)/(x+1))*ln(x)+((-x)-1)*x^(1/(x+1))=0
    x/3=x/5
    4×x×x-3x（20-x）=5x-7x（20-x）+10
    （x-2169.11*12）-【x-（2169*12）-60000】*0.45-181920=10000000
    x×x-x=10
    389152-178.28*（700+273.15）+8.314*（700+273.15）ln(([(100/x)-1]^3)*0.01^1 )= 0

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