25=5/x+15/y

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Solution for 25=5/x+15/y equation: 


D( x )

x = 0

x = 0

x = 0

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

25 = 5/x+15/y // - 5/x+15/y

25-(5/x)-(15/y) = 0

25-5*x^-1-15*y^-1 = 0

-5*x^-1 = -(25-15*y^-1) // : -5

x^-1 = (25-15*y^-1)/5

-1 < 0

1/(x^1) = (25-15*y^-1)/5 // * x^1

1 = x^1*((25-15*y^-1)/5) // : (25-15*y^-1)/5

5*(25-15*y^-1)^-1 = x^1

x = 5*(25-15*y^-1)^-1

x = 5*(25-15*y^-1)^-1

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