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