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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
4 = 96/v // - 96/v
4-(96/v) = 0
4-96*v^-1 = 0
-96*v^-1 = -4 // : -96
v^-1 = 1/24
-1 < 0
1/(v^1) = 1/24 // * v^1
1 = 1/24*v^1 // : 1/24
24 = v^1
v = 24
v = 24
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