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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v = 13/3 // - 13/3
6/v-(13/3) = 0
6/v-13/3 = 0
6*v^-1 = 13/3 // : 6
v^-1 = 13/18
-1 < 0
1/(v^1) = 13/18 // * v^1
1 = 13/18*v^1 // : 13/18
18/13 = v^1
v = 18/13
v = 18/13
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