4=7/w-5

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Solution for 4=7/w-5 equation: 


D( w )

w = 0

w = 0

w = 0

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

4 = 7/w-5 // - 7/w-5

4-(7/w)+5 = 0

4-7*w^-1+5 = 0

-7*w^-1 = -9 // : -7

w^-1 = 9/7

-1 < 0

1/(w^1) = 9/7 // * w^1

1 = 9/7*w^1 // : 9/7

7/9 = w^1

w = 7/9

w = 7/9

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