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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-5 = 8/y-2 // - 8/y-2
2-(8/y)-5 = 0
2-8*y^-1-5 = 0
-8*y^-1 = 3 // : -8
y^-1 = -3/8
-1 < 0
1/(y^1) = -3/8 // * y^1
1 = -3/8*y^1 // : -3/8
-8/3 = y^1
y = -8/3
y = -8/3
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