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