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