21/w=-7

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Solution for 21/w=-7 equation: 


D( w )

w = 0

w = 0

w = 0

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

21/w = -7 // + 7

21/w+7 = 0

21*w^-1 = -7 // : 21

w^-1 = -1/3

-1 < 0

1/(w^1) = -1/3 // * w^1

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

-3 = w^1

w = -3

w = -3

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