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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
9/u = 17/3 // - 17/3
9/u-(17/3) = 0
9/u-17/3 = 0
9*u^-1 = 17/3 // : 9
u^-1 = 17/27
-1 < 0
1/(u^1) = 17/27 // * u^1
1 = 17/27*u^1 // : 17/27
27/17 = u^1
u = 27/17
u = 27/17
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