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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6-5/v = -8 // + 8
6-5/v+8 = 0
-5*v^-1 = -14 // : -5
v^-1 = 14/5
-1 < 0
1/(v^1) = 14/5 // * v^1
1 = 14/5*v^1 // : 14/5
5/14 = v^1
v = 5/14
v = 5/14
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