7/w-1/3

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Solution for 7/w-1/3 equation: 


D( w )

w = 0

w = 0

w = 0

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

7/w-(1/3) = 0

7/w-1/3 = 0

7*w^-1 = 1/3 // : 7

w^-1 = 1/21

-1 < 0

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

1 = 1/21*w^1 // : 1/21

21 = w^1

w = 21

w = 21

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