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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)
3/(a-4) = a/(a-2) // - a/(a-2)
3/(a-4)-(a/(a-2)) = 0
3/(a-4)+(-1*a)/(a-2) = 0
(3*(a-2))/((a-4)*(a-2))+(-1*a*(a-4))/((a-4)*(a-2)) = 0
3*(a-2)-1*a*(a-4) = 0
7*a-a^2-6 = 0
7*a-a^2-6 = 0
7*a-a^2-6 = 0
DELTA = 7^2-(-6*(-1)*4)
DELTA = 25
DELTA > 0
a = (25^(1/2)-7)/(-1*2) or a = (-25^(1/2)-7)/(-1*2)
a = 1 or a = 6
(a-1)*(a-6) = 0
((a-1)*(a-6))/((a-4)*(a-2)) = 0
((a-1)*(a-6))/((a-4)*(a-2)) = 0 // * (a-4)*(a-2)
(a-1)*(a-6) = 0
( a-1 )
a-1 = 0 // + 1
a = 1
( a-6 )
a-6 = 0 // + 6
a = 6
a in { 1, 6 }
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