5-1/x=7

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Solution for 5-1/x=7 equation: 


D( x )

x = 0

x = 0

x = 0

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

5-(1/x) = 7 // - 7

5-(1/x)-7 = 0

5-x^-1-7 = 0

-1*x^-1 = 2 // : -1

x^-1 = -2

-1 < 0

1/(x^1) = -2 // * x^1

1 = -2*x^1 // : -2

-1/2 = x^1

x = -1/2

x = -1/2

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