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D( a )
a-4 = 0
a-4 = 0
a-4 = 0
a-4 = 0 // + 4
a = 4
a in (-oo:4) U (4:+oo)
2*(a-2) = (1-a)/(a-4) // - (1-a)/(a-4)
2*(a-2)-((1-a)/(a-4)) = 0
2*(a-2)+(-1*(1-a))/(a-4) = 0
(2*(a-2)*(a-4))/(a-4)+(-1*(1-a))/(a-4) = 0
2*(a-2)*(a-4)-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) = 0
((a-5/2)*(a-3))/(a-4) = 0 // * a-4
(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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