y=n-7/x

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Solution for y=n-7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

y = n-(7/x) // - n-(7/x)

7/x-n+y = 0

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

x^-1 = (n-y)/7

-1 < 0

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

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

7*(n-y)^-1 = x^1

x = 7*(n-y)^-1

x = 7*(n-y)^-1

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