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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v = 2 // - 2
6/v-2 = 0
6*v^-1 = 2 // : 6
v^-1 = 1/3
-1 < 0
1/(v^1) = 1/3 // * v^1
1 = 1/3*v^1 // : 1/3
3 = v^1
v = 3
v = 3
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