5/((7/x)+8)

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Solution for 5/((7/x)+8) equation: 


D( x )

x = 0

7/x+8 = 0

x = 0

x = 0

7/x+8 = 0

7/x+8 = 0

7*x^-1 = -8 // : 7

x^-1 = -8/7

-1 < 0

1/(x^1) = -8/7 // * x^1

1 = -8/7*x^1 // : -8/7

-7/8 = x^1

x = -7/8

x in (-oo:-7/8) U (-7/8:0) U (0:+oo)

5/(7/x+8) = 0

5/(7*x^-1+8) = 0

x belongs to the empty set

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