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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/13 = 9/y // - 9/y
1/13-(9/y) = 0
1/13-9*y^-1 = 0
-9*y^-1 = -1/13 // : -9
y^-1 = 1/117
-1 < 0
1/(y^1) = 1/117 // * y^1
1 = 1/117*y^1 // : 1/117
117 = y^1
y = 117
y = 117
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