y=7/x

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Solution for y=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = 7/x // - 7/x

y-(7/x) = 0

y-7*x^-1 = 0

-7*x^-1 = -y // : -7

x^-1 = y/7

-1 < 0

1/(x^1) = y/7 // * x^1

1 = x^1*(y/7) // : y/7

7*y^-1 = x^1

x = 7*y^-1

x = 7*y^-1

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