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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-9 = 3 // - 3
5/y-9-3 = 0
5*y^-1 = 12 // : 5
y^-1 = 12/5
-1 < 0
1/(y^1) = 12/5 // * y^1
1 = 12/5*y^1 // : 12/5
5/12 = y^1
y = 5/12
y = 5/12
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