5=20/x-4

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Solution for 5=20/x-4 equation: 


D( x )

x = 0

x = 0

x = 0

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

5 = 20/x-4 // - 20/x-4

4-(20/x)+5 = 0

4-20*x^-1+5 = 0

-20*x^-1 = -9 // : -20

x^-1 = 9/20

-1 < 0

1/(x^1) = 9/20 // * x^1

1 = 9/20*x^1 // : 9/20

20/9 = x^1

x = 20/9

x = 20/9

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