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D( a )
a-8 = 0
a-8 = 0
a-8 = 0
a-8 = 0 // + 8
a = 8
a in (-oo:8) U (8:+oo)
(a^2)/(a-8)+3*a = 0
(a^2)/(a-8)+(3*a*(a-8))/(a-8) = 0
3*a*(a-8)+a^2 = 0
4*a^2-24*a = 0
4*a^2-24*a = 0
4*a*(a-6) = 0
a-6 = 0 // + 6
a = 6
4*a*(a-6) = 0
(4*a*(a-6))/(a-8) = 0
(4*a*(a-6))/(a-8) = 0 // * a-8
4*a*(a-6) = 0
( 4*a )
4*a = 0 // : 4
a = 0
( a-6 )
a-6 = 0 // + 6
a = 6
a in { 0, 6 }
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