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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y = 1/6 // - 1/6
3/y-(1/6) = 0
3/y-1/6 = 0
3*y^-1 = 1/6 // : 3
y^-1 = 1/18
-1 < 0
1/(y^1) = 1/18 // * y^1
1 = 1/18*y^1 // : 1/18
18 = y^1
y = 18
y = 18
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