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