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a in (-oo:+oo)
(8/4)*a^2+(6/3)*a = 0
2*a^2+2*a = 0
DELTA = 2^2-(0*2*4)
DELTA = 4
DELTA > 0
a = (4^(1/2)-2)/(2*2) or a = (-4^(1/2)-2)/(2*2)
a = 0 or a = -1
a in { -1, 0 }
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