9/x-7/w

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Solution for 9/x-7/w equation: 


D( x )

x = 0

x = 0

x = 0

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

9/x-(7/w) = 0

9/x-7*w^-1 = 0

9*x^-1 = -(-7*w^-1) // : 9

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

-1 < 0

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

1 = ((7*w^-1)/9)*x^1 // : (7*w^-1)/9

(9*w)/7 = x^1

x = (9*w)/7

x = (9*w)/7

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