7=91/w

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Solution for 7=91/w equation: 


D( w )

w = 0

w = 0

w = 0

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

7 = 91/w // - 91/w

7-(91/w) = 0

7-91*w^-1 = 0

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

w^-1 = 1/13

-1 < 0

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

1 = 1/13*w^1 // : 1/13

13 = w^1

w = 13

w = 13

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