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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 9.5 // - 9.5
4/y-9.5 = 0
4*y^-1 = 9.5 // : 4
y^-1 = 2.375
-1 < 0
1/(y^1) = 2.375 // * y^1
1 = 2.375*y^1 // : 2.375
0.42105263 = y^1
y = 0.42105263
y = 0.42105263
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