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D( v )
v+2 = 0
v+2 = 0
v+2 = 0
v+2 = 0 // - 2
v = -2
v in (-oo:-2) U (-2:+oo)
(5*(v-4))/(v+2) = 0
v-4 = 0 // + 4
v = 4
v = 4
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