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