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D( v )
v-5 = 0
v+4 = 0
v-5 = 0
v-5 = 0
v-5 = 0 // + 5
v = 5
v+4 = 0
v+4 = 0
v+4 = 0 // - 4
v = -4
v in (-oo:-4) U (-4:5) U (5:+oo)
(v+6)/(v+4)+(v-4)/(v-5)+1 = 0
((v+6)*(v-5))/((v+4)*(v-5))+((v-4)*(v+4))/((v+4)*(v-5))+(1*(v+4)*(v-5))/((v+4)*(v-5)) = 0
(v+6)*(v-5)+(v-4)*(v+4)+1*(v+4)*(v-5) = 0
2*v^2+v^2+v-v-46-20 = 0
3*v^2-66 = 0
(3*v^2-66)/((v+4)*(v-5)) = 0
(3*v^2-66)/((v+4)*(v-5)) = 0 // * (v+4)*(v-5)
3*v^2-66 = 0
3*v^2 = 66 // : 3
v^2 = 22
v^2 = 22 // ^ 1/2
abs(v) = 22^(1/2)
v = 22^(1/2) or v = -22^(1/2)
v in { 22^(1/2), -22^(1/2) }
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