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a in (-oo:+oo)
a-((6/2)*(a-3))-a^2-a = 0
a-3*(a-3)-a^2-a = 0
a-3*(a-3)-a^2-a = 0
a-a^2-3*a-a+9 = 0
9-a^2-2*a-a = 0
9-a^2-3*a = 0
9-a^2-3*a = 0
9-a^2-3*a = 0
DELTA = (-3)^2-(-1*4*9)
DELTA = 45
DELTA > 0
a = (45^(1/2)+3)/(-1*2) or a = (3-45^(1/2))/(-1*2)
a = (3*5^(1/2)+3)/(-2) or a = (3-3*5^(1/2))/(-2)
(a-((3*5^(1/2)+3)/(-2)))*(a-((3-3*5^(1/2))/(-2))) = 0
(a-((3*5^(1/2)+3)/(-2)))*(a-((3-3*5^(1/2))/(-2))) = 0
( a-((3*5^(1/2)+3)/(-2)) )
a-((3*5^(1/2)+3)/(-2)) = 0 // + (3*5^(1/2)+3)/(-2)
a = (3*5^(1/2)+3)/(-2)
( a-((3-3*5^(1/2))/(-2)) )
a-((3-3*5^(1/2))/(-2)) = 0 // + (3-3*5^(1/2))/(-2)
a = (3-3*5^(1/2))/(-2)
a in { (3*5^(1/2)+3)/(-2), (3-3*5^(1/2))/(-2) }
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