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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(v^2-(5*v))/v = 0
(v^2-5*v)/v = 0
v^2-5*v = 0
v*(v-5) = 0
v-5 = 0 // + 5
v = 5
v*(v-5) = 0
v-5 = 0
v-5 = 0 // + 5
v = 5
v = 5
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