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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
-6 = -3/u-1 // + -3/u-1
1-(-3/u)-6 = 0
3*u^-1-6+1 = 0
3*u^-1 = 5 // : 3
u^-1 = 5/3
-1 < 0
1/(u^1) = 5/3 // * u^1
1 = 5/3*u^1 // : 5/3
3/5 = u^1
u = 3/5
u = 3/5
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