28/49=4/w

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Solution for 28/49=4/w equation: 


D( w )

w = 0

w = 0

w = 0

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

28/49 = 4/w // - 4/w

28/49-(4/w) = 0

28/49-4*w^-1 = 0

-4*w^-1 = -4/7 // : -4

w^-1 = 1/7

-1 < 0

1/(w^1) = 1/7 // * w^1

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

7 = w^1

w = 7

w = 7

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