4=72/u

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Solution for 4=72/u equation: 


D( u )

u = 0

u = 0

u = 0

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

4 = 72/u // - 72/u

4-(72/u) = 0

4-72*u^-1 = 0

-72*u^-1 = -4 // : -72

u^-1 = 1/18

-1 < 0

1/(u^1) = 1/18 // * u^1

1 = 1/18*u^1 // : 1/18

18 = u^1

u = 18

u = 18

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