4/u=20/25

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Solution for 4/u=20/25 equation: 


D( u )

u = 0

u = 0

u = 0

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

4/u = 20/25 // - 20/25

4/u-(20/25) = 0

4/u-4/5 = 0

4*u^-1 = 4/5 // : 4

u^-1 = 1/5

-1 < 0

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

1 = 1/5*u^1 // : 1/5

5 = u^1

u = 5

u = 5

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