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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
5/4 = 3/u // - 3/u
5/4-(3/u) = 0
5/4-3*u^-1 = 0
-3*u^-1 = -5/4 // : -3
u^-1 = 5/12
-1 < 0
1/(u^1) = 5/12 // * u^1
1 = 5/12*u^1 // : 5/12
12/5 = u^1
u = 12/5
u = 12/5
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