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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-6/y = 9 // - 9
-6/y-9 = 0
-6*y^-1 = 9 // : -6
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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