-4/x+13=21

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Solution for -4/x+13=21 equation: 


D( x )

x = 0

x = 0

x = 0

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

13-4/x = 21 // - 21

13-4/x-21 = 0

-4*x^-1 = 8 // : -4

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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