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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/8 = 25/y // - 25/y
5/8-(25/y) = 0
5/8-25*y^-1 = 0
-25*y^-1 = -5/8 // : -25
y^-1 = 1/40
-1 < 0
1/(y^1) = 1/40 // * y^1
1 = 1/40*y^1 // : 1/40
40 = y^1
y = 40
y = 40
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