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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
6/u = -24 // + 24
6/u+24 = 0
6*u^-1 = -24 // : 6
u^-1 = -4
-1 < 0
1/(u^1) = -4 // * u^1
1 = -4*u^1 // : -4
-1/4 = u^1
u = -1/4
u = -1/4
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