13=-4/x

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Solution for 13=-4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

13 = -4/x // + -4/x

13-(-4/x) = 0

4*x^-1+13 = 0

4*x^-1 = -13 // : 4

x^-1 = -13/4

-1 < 0

1/(x^1) = -13/4 // * x^1

1 = -13/4*x^1 // : -13/4

-4/13 = x^1

x = -4/13

x = -4/13

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