18=72/x

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Solution for 18=72/x equation: 


D( x )

x = 0

x = 0

x = 0

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

18 = 72/x // - 72/x

18-(72/x) = 0

18-72*x^-1 = 0

-72*x^-1 = -18 // : -72

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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