4/x=9/x-20

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Solution for 4/x=9/x-20 equation: 


D( x )

x = 0

x = 0

x = 0

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

4/x = 9/x-20 // - 9/x-20

4/x-(9/x)+20 = 0

4/x-9*x^-1+20 = 0

-5*x^-1 = -20 // : -5

x^-1 = 4

-1 < 0

1/(x^1) = 4 // * x^1

1 = 4*x^1 // : 4

1/4 = x^1

x = 1/4

x = 1/4

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