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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y-(2/3)-1 = 4/y+1 // - 4/y+1
2/y-(4/y)-(2/3)-1-1 = 0
2/y-4*y^-1-2/3-1-1 = 0
-2*y^-1 = 8/3 // : -2
y^-1 = -4/3
-1 < 0
1/(y^1) = -4/3 // * y^1
1 = -4/3*y^1 // : -4/3
-3/4 = y^1
y = -3/4
y = -3/4
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