91/w=7

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Solution for 91/w=7 equation: 


D( w )

w = 0

w = 0

w = 0

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

91/w = 7 // - 7

91/w-7 = 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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