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D( a )
a-4 = 0
a-2 = 0
a-4 = 0
a-4 = 0
a-4 = 0 // + 4
a = 4
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a in (-oo:2) U (2:4) U (4:+oo)
2 = ((1-a)/(a-4))/(a-2) // - ((1-a)/(a-4))/(a-2)
2-(((1-a)/(a-4))/(a-2)) = 0
(-1*(1-a))/((a-4)*(a-2))+2 = 0
(-1*(1-a))/((a-4)*(a-2))+(2*(a-4)*(a-2))/((a-4)*(a-2)) = 0
2*(a-4)*(a-2)-1*(1-a) = 0
2*a^2-11*a+15 = 0
2*a^2-11*a+15 = 0
2*a^2-11*a+15 = 0
DELTA = (-11)^2-(2*4*15)
DELTA = 1
DELTA > 0
a = (1^(1/2)+11)/(2*2) or a = (11-1^(1/2))/(2*2)
a = 3 or a = 5/2
(a-5/2)*(a-3) = 0
((a-5/2)*(a-3))/((a-4)*(a-2)) = 0
((a-5/2)*(a-3))/((a-4)*(a-2)) = 0 // * (a-4)*(a-2)
(a-5/2)*(a-3) = 0
( a-3 )
a-3 = 0 // + 3
a = 3
( a-5/2 )
a-5/2 = 0 // + 5/2
a = 5/2
a in { 3, 5/2 }
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