24/21=40/u

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Solution for 24/21=40/u equation: 


D( u )

u = 0

u = 0

u = 0

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

24/21 = 40/u // - 40/u

24/21-(40/u) = 0

24/21-40*u^-1 = 0

-40*u^-1 = -8/7 // : -40

u^-1 = 1/35

-1 < 0

1/(u^1) = 1/35 // * u^1

1 = 1/35*u^1 // : 1/35

35 = u^1

u = 35

u = 35

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