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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y = -6 // + 6
9/y+6 = 0
9*y^-1 = -6 // : 9
y^-1 = -2/3
-1 < 0
1/(y^1) = -2/3 // * y^1
1 = -2/3*y^1 // : -2/3
-3/2 = y^1
y = -3/2
y = -3/2
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