21=105/u

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Solution for 21=105/u equation: 


D( u )

u = 0

u = 0

u = 0

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

21 = 105/u // - 105/u

21-(105/u) = 0

21-105*u^-1 = 0

-105*u^-1 = -21 // : -105

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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