y=4/(5x)

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Solution for y=4/(5x) equation: 


D( x )

5*x = 0

5*x = 0

5*x = 0

5*x = 0 // : 5

x = 0

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

y = 4/(5*x) // - 4/(5*x)

y-(4/(5*x)) = 0

(-4/5)*x^-1+y = 0

-4/5*x^-1 = -y // : -4/5

x^-1 = 5/4*y

-1 < 0

1/(x^1) = 5/4*y // * x^1

1 = 5/4*x^1*y // : 5/4*y

4/5*y^-1 = x^1

x = 4/5*y^-1

x = 4/5*y^-1

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