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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
17/11 = 8/u // - 8/u
17/11-(8/u) = 0
17/11-8*u^-1 = 0
-8*u^-1 = -17/11 // : -8
u^-1 = 17/88
-1 < 0
1/(u^1) = 17/88 // * u^1
1 = 17/88*u^1 // : 17/88
88/17 = u^1
u = 88/17
u = 88/17
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