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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)
(((3*a+1)*(a-2))/(a-2))*(a-3) = 0
(3*a+1)*(a-3) = 0
( 3*a+1 )
3*a+1 = 0 // - 1
3*a = -1 // : 3
a = -1/3
( a-3 )
a-3 = 0 // + 3
a = 3
a in { -1/3, 3 }
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