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D( u )
u-5 = 0
u-2 = 0
u-5 = 0
u-5 = 0
u-5 = 0 // + 5
u = 5
u-2 = 0
u-2 = 0
u-2 = 0 // + 2
u = 2
u in (-oo:2) U (2:5) U (5:+oo)
(u-4)/(u-2) = (u+1)/(u-5)+1 // - (u+1)/(u-5)+1
(u-4)/(u-2)-((u+1)/(u-5))-1 = 0
(u-4)/(u-2)+(-1*(u+1))/(u-5)-1 = 0
((u-4)*(u-5))/((u-2)*(u-5))+(-1*(u+1)*(u-2))/((u-2)*(u-5))+(-1*(u-2)*(u-5))/((u-2)*(u-5)) = 0
(u-4)*(u-5)-1*(u+1)*(u-2)-1*(u-2)*(u-5) = 0
7*u-u^2-8*u-10+22 = 0
12-u^2-u = 0
12-u^2-u = 0
12-u^2-u = 0
DELTA = (-1)^2-(-1*4*12)
DELTA = 49
DELTA > 0
u = (49^(1/2)+1)/(-1*2) or u = (1-49^(1/2))/(-1*2)
u = -4 or u = 3
(u+4)*(u-3) = 0
((u+4)*(u-3))/((u-2)*(u-5)) = 0
((u+4)*(u-3))/((u-2)*(u-5)) = 0 // * (u-2)*(u-5)
(u+4)*(u-3) = 0
( u+4 )
u+4 = 0 // - 4
u = -4
( u-3 )
u-3 = 0 // + 3
u = 3
u in { -4, 3 }
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