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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y = 8/11 // - 8/11
9/y-(8/11) = 0
9/y-8/11 = 0
9*y^-1 = 8/11 // : 9
y^-1 = 8/99
-1 < 0
1/(y^1) = 8/99 // * y^1
1 = 8/99*y^1 // : 8/99
99/8 = y^1
y = 99/8
y = 99/8
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