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a in (-oo:+oo)
a^2*((30*a^3-(18*a^2)-(54*a))/6) = 0
a^2*((30*a^3-18*a^2-54*a)/6) = 0
(a^2*(30*a^3-18*a^2-54*a))/6 = 0
30*a^3-18*a^2-54*a = 0
6*a*(5*a^2-3*a-9) = 0
5*a^2-3*a-9 = 0
DELTA = (-3)^2-(-9*4*5)
DELTA = 189
DELTA > 0
a = (189^(1/2)+3)/(2*5) or a = (3-189^(1/2))/(2*5)
a = (3*21^(1/2)+3)/10 or a = (3-3*21^(1/2))/10
6*a*(a-((3-3*21^(1/2))/10))*(a-((3*21^(1/2)+3)/10)) = 0
(6*a*a^2*(a-((3-3*21^(1/2))/10))*(a-((3*21^(1/2)+3)/10)))/6 = 0
( 6*a )
6*a = 0 // : 6
a = 0
( a-((3*21^(1/2)+3)/10) )
a-((3*21^(1/2)+3)/10) = 0 // + (3*21^(1/2)+3)/10
a = (3*21^(1/2)+3)/10
( a-((3-3*21^(1/2))/10) )
a-((3-3*21^(1/2))/10) = 0 // + (3-3*21^(1/2))/10
a = (3-3*21^(1/2))/10
( a^2 )
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in { 0, (3*21^(1/2)+3)/10, (3-3*21^(1/2))/10, 0 }
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