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