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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*y)/x = 3*z // - 3*z
(6*y)/x-(3*z) = 0
(6*y)/x-3*z = 0
6*x^-1*y = -(-3*z) // : 6*y
x^-1 = (1/2)*y^-1*z
-1 < 0
1/(x^1) = (1/2)*y^-1*z // * x^1
1 = (1/2)*x^1*y^-1*z // : (1/2)*y^-1*z
2*y*z^-1 = x^1
x = 2*y*z^-1
x = 2*y*z^-1
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