9/x=15/x-4

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Solution for 9/x=15/x-4 equation: 


D( x )

x = 0

x = 0

x = 0

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

9/x = 15/x-4 // - 15/x-4

9/x-(15/x)+4 = 0

9/x-15*x^-1+4 = 0

-6*x^-1 = -4 // : -6

x^-1 = 2/3

-1 < 0

1/(x^1) = 2/3 // * x^1

1 = 2/3*x^1 // : 2/3

3/2 = x^1

x = 3/2

x = 3/2

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