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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
3/u = 27/162 // - 27/162
3/u-(27/162) = 0
3/u-1/6 = 0
3*u^-1 = 1/6 // : 3
u^-1 = 1/18
-1 < 0
1/(u^1) = 1/18 // * u^1
1 = 1/18*u^1 // : 1/18
18 = u^1
u = 18
u = 18
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