21/28=3/w

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Solution for 21/28=3/w equation: 


D( w )

w = 0

w = 0

w = 0

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

21/28 = 3/w // - 3/w

21/28-(3/w) = 0

21/28-3*w^-1 = 0

-3*w^-1 = -3/4 // : -3

w^-1 = 1/4

-1 < 0

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

1 = 1/4*w^1 // : 1/4

4 = w^1

w = 4

w = 4

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