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y in (-oo:+oo)
(1/5)*y^2 = -y-(1/10) // + -y-(1/10)
(1/5)*y^2+y+1/10 = 0
1/5*y^2+y+1/10 = 0
DELTA = 1^2-(1/10*1/5*4)
DELTA = 23/25
DELTA > 0
y = ((23/25)^(1/2)-1)/(1/5*2) or y = (-(23/25)^(1/2)-1)/(1/5*2)
y = 5/2*((23/25)^(1/2)-1) or y = -5/2*((23/25)^(1/2)+1)
y in { -5/2*((23/25)^(1/2)+1), 5/2*((23/25)^(1/2)-1) }
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