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D( v )
v+2 = 0
v-6 = 0
v+2 = 0
v+2 = 0
v+2 = 0 // - 2
v = -2
v-6 = 0
v-6 = 0
v-6 = 0 // + 6
v = 6
v in (-oo:-2) U (-2:6) U (6:+oo)
(v+5)/(v+2) = (v-5)/(v-6)+1 // - (v-5)/(v-6)+1
(v+5)/(v+2)-((v-5)/(v-6))-1 = 0
(v+5)/(v+2)+(-1*(v-5))/(v-6)-1 = 0
((v+5)*(v-6))/((v+2)*(v-6))+(-1*(v-5)*(v+2))/((v+2)*(v-6))+(-1*(v+2)*(v-6))/((v+2)*(v-6)) = 0
(v+5)*(v-6)-1*(v-5)*(v+2)-1*(v+2)*(v-6) = 0
2*v-v^2+4*v-20+12 = 0
6*v-v^2-8 = 0
6*v-v^2-8 = 0
6*v-v^2-8 = 0
DELTA = 6^2-(-8*(-1)*4)
DELTA = 4
DELTA > 0
v = (4^(1/2)-6)/(-1*2) or v = (-4^(1/2)-6)/(-1*2)
v = 2 or v = 4
(v-2)*(v-4) = 0
((v-2)*(v-4))/((v+2)*(v-6)) = 0
((v-2)*(v-4))/((v+2)*(v-6)) = 0 // * (v+2)*(v-6)
(v-2)*(v-4) = 0
( v-2 )
v-2 = 0 // + 2
v = 2
( v-4 )
v-4 = 0 // + 4
v = 4
v in { 2, 4 }
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