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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
3/2.4 = 12/u // - 12/u
3/2.4-(12/u) = 0
3/2.4-12*u^-1 = 0
-12*u^-1 = -1.25 // : -12
u^-1 = 0.10416667
-1 < 0
1/(u^1) = 0.10416667 // * u^1
1 = 0.10416667*u^1 // : 0.10416667
9.59999969 = u^1
u = 9.59999969
u = 9.59999969
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