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D( v )
v-3 = 0
v-5 = 0
v-3 = 0
v-3 = 0
v-3 = 0 // + 3
v = 3
v-5 = 0
v-5 = 0
v-5 = 0 // + 5
v = 5
v in (-oo:3) U (3:5) U (5:+oo)
(v+5)/(v-3) = (v+7)/(v-5)+1 // - (v+7)/(v-5)+1
(v+5)/(v-3)-((v+7)/(v-5))-1 = 0
(v+5)/(v-3)+(-1*(v+7))/(v-5)-1 = 0
((v+5)*(v-5))/((v-3)*(v-5))+(-1*(v+7)*(v-3))/((v-3)*(v-5))+(-1*(v-3)*(v-5))/((v-3)*(v-5)) = 0
(v+5)*(v-5)-1*(v+7)*(v-3)-1*(v-3)*(v-5) = 0
8*v-v^2-4*v-15-4 = 0
4*v-v^2-19 = 0
4*v-v^2-19 = 0
4*v-v^2-19 = 0
DELTA = 4^2-(-19*(-1)*4)
DELTA = -60
DELTA < 0
1 = 0
1/((v-3)*(v-5)) = 0
1/((v-3)*(v-5)) = 0 // * (v-3)*(v-5)
1 = 0
v belongs to the empty set
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