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