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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
12/15.2 = 9/y // - 9/y
12/15.2-(9/y) = 0
12/15.2-9*y^-1 = 0
-9*y^-1 = -0.78947368 // : -9
y^-1 = 0.0877193
-1 < 0
1/(y^1) = 0.0877193 // * y^1
1 = 0.0877193*y^1 // : 0.0877193
11.39999977 = y^1
y = 11.39999977
y = 11.39999977
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