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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
25/y = 4 // - 4
25/y-4 = 0
25*y^-1 = 4 // : 25
y^-1 = 4/25
-1 < 0
1/(y^1) = 4/25 // * y^1
1 = 4/25*y^1 // : 4/25
25/4 = y^1
y = 25/4
y = 25/4
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