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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
48/u = -3 // + 3
48/u+3 = 0
48*u^-1 = -3 // : 48
u^-1 = -1/16
-1 < 0
1/(u^1) = -1/16 // * u^1
1 = -1/16*u^1 // : -1/16
-16 = u^1
u = -16
u = -16
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