80/4=5/w

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Solution for 80/4=5/w equation: 


D( w )

w = 0

w = 0

w = 0

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

80/4 = 5/w // - 5/w

80/4-(5/w) = 0

80/4-5*w^-1 = 0

-5*w^-1 = -20 // : -5

w^-1 = 4

-1 < 0

1/(w^1) = 4 // * w^1

1 = 4*w^1 // : 4

1/4 = w^1

w = 1/4

w = 1/4

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