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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
9/u-2 = 6/5 // - 6/5
9/u-(6/5)-2 = 0
9/u-6/5-2 = 0
9*u^-1 = 16/5 // : 9
u^-1 = 16/45
-1 < 0
1/(u^1) = 16/45 // * u^1
1 = 16/45*u^1 // : 16/45
45/16 = u^1
u = 45/16
u = 45/16
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