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