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D( u )
u+1 = 0
u+2 = 0
u+1 = 0
u+1 = 0
u+1 = 0 // - 1
u = -1
u+2 = 0
u+2 = 0
u+2 = 0 // - 2
u = -2
u in (-oo:-2) U (-2:-1) U (-1:+oo)
1/(u+1)+6 = 2/(u+2) // - 2/(u+2)
1/(u+1)-(2/(u+2))+6 = 0
1/(u+1)-2*(u+2)^-1+6 = 0
1/(u+1)-2/(u+2)+6 = 0
(1*(u+2))/((u+1)*(u+2))+(-2*(u+1))/((u+1)*(u+2))+(6*(u+1)*(u+2))/((u+1)*(u+2)) = 0
1*(u+2)-2*(u+1)+6*(u+1)*(u+2) = 0
6*u^2-u+18*u+12 = 0
6*u^2+17*u+12 = 0
6*u^2+17*u+12 = 0
6*u^2+17*u+12 = 0
DELTA = 17^2-(4*6*12)
DELTA = 1
DELTA > 0
u = (1^(1/2)-17)/(2*6) or u = (-1^(1/2)-17)/(2*6)
u = -4/3 or u = -3/2
(u+3/2)*(u+4/3) = 0
((u+3/2)*(u+4/3))/((u+1)*(u+2)) = 0
((u+3/2)*(u+4/3))/((u+1)*(u+2)) = 0 // * (u+1)*(u+2)
(u+3/2)*(u+4/3) = 0
( u+3/2 )
u+3/2 = 0 // - 3/2
u = -3/2
( u+4/3 )
u+4/3 = 0 // - 4/3
u = -4/3
u in { -3/2, -4/3 }
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