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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
25/9 = 8/y // - 8/y
25/9-(8/y) = 0
25/9-8*y^-1 = 0
-8*y^-1 = -25/9 // : -8
y^-1 = 25/72
-1 < 0
1/(y^1) = 25/72 // * y^1
1 = 25/72*y^1 // : 25/72
72/25 = y^1
y = 72/25
y = 72/25
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