7/((2/x)-4)

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Solution for 7/((2/x)-4) equation: 


D( x )

x = 0

2/x-4 = 0

x = 0

x = 0

2/x-4 = 0

2/x-4 = 0

2*x^-1 = 4 // : 2

x^-1 = 2

-1 < 0

1/(x^1) = 2 // * x^1

1 = 2*x^1 // : 2

1/2 = x^1

x = 1/2

x in (-oo:0) U (0:1/2) U (1/2:+oo)

7/(2/x-4) = 0

7/(2*x^-1-4) = 0

x belongs to the empty set

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