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D( a )
3*a-1 = 0
3*a-1 = 0
3*a-1 = 0
3*a-1 = 0 // + 1
3*a = 1 // : 3
a = 1/3
a in (-oo:1/3) U (1/3:+oo)
(9*a^3-(28*a))/(3*a-1) = 0
(9*a^3-28*a)/(3*a-1) = 0
9*a^3-28*a = 0
a*(9*a^2-28) = 0
9*a^2 = 28 // : 9
a^2 = 28/9
a^2 = 28/9 // ^ 1/2
abs(a) = (28/9)^(1/2)
a = (28/9)^(1/2) or a = -(28/9)^(1/2)
a*(a-(28/9)^(1/2))*(a+(28/9)^(1/2)) = 0
(a*(a-(28/9)^(1/2))*(a+(28/9)^(1/2)))/(3*a-1) = 0
( a+(28/9)^(1/2) )
a+(28/9)^(1/2) = 0 // - (28/9)^(1/2)
a = -(28/9)^(1/2)
( a-(28/9)^(1/2) )
a-(28/9)^(1/2) = 0 // + (28/9)^(1/2)
a = (28/9)^(1/2)
( a )
a = 0
a in { -(28/9)^(1/2), (28/9)^(1/2), 0 }
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