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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 6/y // - 6/y
4/x-(6/y) = 0
4/x-6*y^-1 = 0
4*x^-1 = -(-6*y^-1) // : 4
x^-1 = (3*y^-1)/2
-1 < 0
1/(x^1) = (3*y^-1)/2 // * x^1
1 = x^1*((3*y^-1)/2) // : (3*y^-1)/2
(2*y)/3 = x^1
x = (2*y)/3
x = (2*y)/3
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