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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5/11 = 4/v // - 4/v
5/11-(4/v) = 0
5/11-4*v^-1 = 0
-4*v^-1 = -5/11 // : -4
v^-1 = 5/44
-1 < 0
1/(v^1) = 5/44 // * v^1
1 = 5/44*v^1 // : 5/44
44/5 = v^1
v = 44/5
v = 44/5
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