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D( v )
v = 0
v-6 = 0
v^2-(5*v)-6 = 0
v = 0
v = 0
v-6 = 0
v-6 = 0
v-6 = 0 // + 6
v = 6
v^2-(5*v)-6 = 0
v^2-(5*v)-6 = 0
v^2-5*v-6 = 0
v^2-5*v-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
v = (49^(1/2)+5)/(1*2) or v = (5-49^(1/2))/(1*2)
v = 6 or v = -1
v in (-oo:-1) U (-1:0) U (0:6) U (6:+oo)
(((5*v)/(v^2-(5*v)-6))/v)/(v-6) = 0
(((5*v)/(v^2-5*v-6))/v)/(v-6) = 0
(5*v)/(v*(v^2-5*v-6)*(v-6)) = 0
v^2-5*v-6 = 0
v^2-5*v-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
v = (49^(1/2)+5)/(1*2) or v = (5-49^(1/2))/(1*2)
v = 6 or v = -1
(v+1)*(v-6) = 0
(5*v)/(v*(v+1)*(v-6)^2) = 0
5*v = 0 // : 5
v = 0
v in { 0}
v belongs to the empty set
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