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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-5 = 6/y // - 6/y
-(6/y)-5 = 0
-6*y^-1-5 = 0
-6*y^-1 = 5 // : -6
y^-1 = -5/6
-1 < 0
1/(y^1) = -5/6 // * y^1
1 = -5/6*y^1 // : -5/6
-6/5 = y^1
y = -6/5
y = -6/5
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