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D( v )
v+6 = 0
2/v+1 = 0
v = 0
v+6 = 0
v+6 = 0
v+6 = 0 // - 6
v = -6
2/v+1 = 0
2/v+1 = 0
2*v^-1 = -1 // : 2
v^-1 = -1/2
-1 < 0
1/(v^1) = -1/2 // * v^1
1 = -1/2*v^1 // : -1/2
-2 = v^1
v = -2
v = 0
v = 0
v in (-oo:-6) U (-6:-2) U (-2:0) U (0:+oo)
(8/(v+6)+v)/(2/v+1) = 0
(8/(v+6)+v)/(2*v^-1+1) = 0
8/(v+6)+v = 0
8/(v+6)+(v*(v+6))/(v+6) = 0
v*(v+6)+8 = 0
v^2+6*v+8 = 0
v^2+6*v+8 = 0
v^2+6*v+8 = 0
DELTA = 6^2-(1*4*8)
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+4)*(v+2) = 0
((v+4)*(v+2))/(v+6) = 0
((v+4)*(v+2))/(v+6) = 0 // * v+6
(v+4)*(v+2) = 0
((v+4)*(v+2))/(2*v^-1+1) = 0
( v+2 )
v+2 = 0 // - 2
v = -2
( v+4 )
v+4 = 0 // - 4
v = -4
v in { -2}
v = -4
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