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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x-(3/w) = 0
8/x-3*w^-1 = 0
8*x^-1 = -(-3*w^-1) // : 8
x^-1 = (3*w^-1)/8
-1 < 0
1/(x^1) = (3*w^-1)/8 // * x^1
1 = ((3*w^-1)/8)*x^1 // : (3*w^-1)/8
(8*w)/3 = x^1
x = (8*w)/3
x = (8*w)/3
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