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D( a )
a-2 = 0
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a in (-oo:2) U (2:+oo)
(a+4)/(a-2)-3 = a/4 // - a/4
(a+4)/(a-2)-(a/4)-3 = 0
(a+4)/(a-2)-a/4-3 = 0
(4*(a+4))/(4*(a-2))+(-a*(a-2))/(4*(a-2))+(-3*4*(a-2))/(4*(a-2)) = 0
4*(a+4)-a*(a-2)-3*4*(a-2) = 0
6*a-a^2-12*a+16+24 = 0
40-a^2-6*a = 0
40-a^2-6*a = 0
40-a^2-6*a = 0
DELTA = (-6)^2-(-1*4*40)
DELTA = 196
DELTA > 0
a = (196^(1/2)+6)/(-1*2) or a = (6-196^(1/2))/(-1*2)
a = -10 or a = 4
(a+10)*(a-4) = 0
((a+10)*(a-4))/(4*(a-2)) = 0
((a+10)*(a-4))/(4*(a-2)) = 0 // * 4*(a-2)
(a+10)*(a-4) = 0
( a+10 )
a+10 = 0 // - 10
a = -10
( a-4 )
a-4 = 0 // + 4
a = 4
a in { -10, 4 }
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