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