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