(1/x)-(4/y)

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Solution for (1/x)-(4/y) equation: 


D( x )

x = 0

x = 0

x = 0

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

1/x-(4/y) = 0

1/x-4*y^-1 = 0

1*x^-1 = -(-4*y^-1) // : 1

x^-1 = 4*y^-1

-1 < 0

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

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

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

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

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

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