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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
8/v = 2 // - 2
8/v-2 = 0
8*v^-1 = 2 // : 8
v^-1 = 1/4
-1 < 0
1/(v^1) = 1/4 // * v^1
1 = 1/4*v^1 // : 1/4
4 = v^1
v = 4
v = 4
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