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a in (-oo:+oo)
5*a-((6*a^2)/3)-(2*a)+6 = 0
5*a-2*a^2-2*a+6 = 0
3*a-2*a^2+6 = 0
DELTA = 3^2-(-2*4*6)
DELTA = 57
DELTA > 0
a = (57^(1/2)-3)/(-2*2) or a = (-57^(1/2)-3)/(-2*2)
a = (57^(1/2)-3)/(-4) or a = (57^(1/2)+3)/4
a in { (57^(1/2)-3)/(-4), (57^(1/2)+3)/4 }
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