5=-20/x

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Solution for 5=-20/x equation: 


D( x )

x = 0

x = 0

x = 0

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

5 = -20/x // + -20/x

5-(-20/x) = 0

20*x^-1+5 = 0

20*x^-1 = -5 // : 20

x^-1 = -1/4

-1 < 0

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

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

-4 = x^1

x = -4

x = -4

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