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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/19 = 9/y // - 9/y
6/19-(9/y) = 0
6/19-9*y^-1 = 0
-9*y^-1 = -6/19 // : -9
y^-1 = 2/57
-1 < 0
1/(y^1) = 2/57 // * y^1
1 = 2/57*y^1 // : 2/57
57/2 = y^1
y = 57/2
y = 57/2
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