21/x-5=-2

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Solution for 21/x-5=-2 equation: 


D( x )

x = 0

x = 0

x = 0

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

21/x-5 = -2 // + 2

21/x-5+2 = 0

21*x^-1 = 3 // : 21

x^-1 = 1/7

-1 < 0

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

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

7 = x^1

x = 7

x = 7

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