(x/x-9)-(9/x+9)=18x/x^2-81

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Solution for (x/x-9)-(9/x+9)=18x/x^2-81 equation: 


D( x )

x = 0

x^2 = 0

x = 0

x = 0

x^2 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x in (-oo:0) U (0:+oo)

x/x-(9/x)-9-9 = (18*x)/(x^2)-81 // - (18*x)/(x^2)-81

x/x-(9/x)-((18*x)/(x^2))-9-9+81 = 0

x/x-9*x^-1-18*x^-1-9-9+81 = 0

-27*x^-1 = -64 // : -27

x^-1 = 64/27

-1 < 0

1/(x^1) = 64/27 // * x^1

1 = 64/27*x^1 // : 64/27

27/64 = x^1

x = 27/64

x = 27/64

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