7=91/v

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Solution for 7=91/v equation: 


D( v )

v = 0

v = 0

v = 0

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

7 = 91/v // - 91/v

7-(91/v) = 0

7-91*v^-1 = 0

-91*v^-1 = -7 // : -91

v^-1 = 1/13

-1 < 0

1/(v^1) = 1/13 // * v^1

1 = 1/13*v^1 // : 1/13

13 = v^1

v = 13

v = 13

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