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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(7/w) = 0
6/x-7*w^-1 = 0
6*x^-1 = -(-7*w^-1) // : 6
x^-1 = (7*w^-1)/6
-1 < 0
1/(x^1) = (7*w^-1)/6 // * x^1
1 = ((7*w^-1)/6)*x^1 // : (7*w^-1)/6
(6*w)/7 = x^1
x = (6*w)/7
x = (6*w)/7
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