9/v-2/v=21

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Solution for 9/v-2/v=21 equation: 


D( v )

v = 0

v = 0

v = 0

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

9/v-(2/v) = 21 // - 21

9/v-(2/v)-21 = 0

9/v-2*v^-1-21 = 0

7*v^-1 = 21 // : 7

v^-1 = 3

-1 < 0

1/(v^1) = 3 // * v^1

1 = 3*v^1 // : 3

1/3 = v^1

v = 1/3

v = 1/3

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