28/w=7

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Solution for 28/w=7 equation: 


D( w )

w = 0

w = 0

w = 0

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

28/w = 7 // - 7

28/w-7 = 0

28*w^-1 = 7 // : 28

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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