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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y = 5/6 // - 5/6
9/y-(5/6) = 0
9/y-5/6 = 0
9*y^-1 = 5/6 // : 9
y^-1 = 5/54
-1 < 0
1/(y^1) = 5/54 // * y^1
1 = 5/54*y^1 // : 5/54
54/5 = y^1
y = 54/5
y = 54/5
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