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D( a )
3*a^3 = 0
3*a^3 = 0
3*a^3 = 0
3*a^3 = 0 // : 3
a^3 = 0
a = 0
a in (-oo:0) U (0:+oo)
(6*a^4+9*a^3)/(3*a^3) = 0
6*a^4+9*a^3 = 0
3*a^3*(2*a+3) = 0
2*a+3 = 0 // - 3
2*a = -3 // : 2
a = -3/2
3*a^3*(a+3/2) = 0
a+3/2 = 0
a+3/2 = 0 // - 3/2
a = -3/2
a = -3/2
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