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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
24 = 744/u // - 744/u
24-(744/u) = 0
24-744*u^-1 = 0
-744*u^-1 = -24 // : -744
u^-1 = 1/31
-1 < 0
1/(u^1) = 1/31 // * u^1
1 = 1/31*u^1 // : 1/31
31 = u^1
u = 31
u = 31
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