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