8=(40/x)

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Solution for 8=(40/x) equation: 


D( x )

x = 0

x = 0

x = 0

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

8 = 40/x // - 40/x

8-(40/x) = 0

8-40*x^-1 = 0

-40*x^-1 = -8 // : -40

x^-1 = 1/5

-1 < 0

1/(x^1) = 1/5 // * x^1

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

5 = x^1

x = 5

x = 5

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