84/v=4

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Solution for 84/v=4 equation: 


D( v )

v = 0

v = 0

v = 0

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

84/v = 4 // - 4

84/v-4 = 0

84*v^-1 = 4 // : 84

v^-1 = 1/21

-1 < 0

1/(v^1) = 1/21 // * v^1

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

21 = v^1

v = 21

v = 21

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