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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/4 = 8/y // - 8/y
1/4-(8/y) = 0
1/4-8*y^-1 = 0
-8*y^-1 = -1/4 // : -8
y^-1 = 1/32
-1 < 0
1/(y^1) = 1/32 // * y^1
1 = 1/32*y^1 // : 1/32
32 = y^1
y = 32
y = 32
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