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v in (-oo:+oo)
(((v+5)*(v-1))/3)*(v+5)*(v-5) = 0
((v+5)^2*(v-1)*(v-5))/3 = 0
( v+5 )
v+5 = 0 // - 5
v = -5
( v-1 )
v-1 = 0 // + 1
v = 1
( v-5 )
v-5 = 0 // + 5
v = 5
v in { -5, -5, 1, 5 }
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