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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(9/v)*v*((-2*v^4)/7) = 0
-18/7*v^4 = 0 // : -18/7
v^4 = 0
v = 0
v in { 0}
v belongs to the empty set
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