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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
664/y = 4/6 // - 4/6
664/y-(4/6) = 0
664/y-2/3 = 0
664*y^-1 = 2/3 // : 664
y^-1 = 1/996
-1 < 0
1/(y^1) = 1/996 // * y^1
1 = 1/996*y^1 // : 1/996
996 = y^1
y = 996
y = 996
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