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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3/4 = 8/w // - 8/w
3/4-(8/w) = 0
3/4-8*w^-1 = 0
-8*w^-1 = -3/4 // : -8
w^-1 = 3/32
-1 < 0
1/(w^1) = 3/32 // * w^1
1 = 3/32*w^1 // : 3/32
32/3 = w^1
w = 32/3
w = 32/3
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