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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
11/5 = 10/u // - 10/u
11/5-(10/u) = 0
11/5-10*u^-1 = 0
-10*u^-1 = -11/5 // : -10
u^-1 = 11/50
-1 < 0
1/(u^1) = 11/50 // * u^1
1 = 11/50*u^1 // : 11/50
50/11 = u^1
u = 50/11
u = 50/11
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