3/u+7=21

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Solution for 3/u+7=21 equation: 


D( u )

u = 0

u = 0

u = 0

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

3/u+7 = 21 // - 21

3/u-21+7 = 0

3*u^-1 = 14 // : 3

u^-1 = 14/3

-1 < 0

1/(u^1) = 14/3 // * u^1

1 = 14/3*u^1 // : 14/3

3/14 = u^1

u = 3/14

u = 3/14

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