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y in (-oo:+oo)
((4*y)/4)*y-(4*y)-(1/1)-1 = 0
((4*y)/4)*y-4*y-1-1 = 0
y^2-4*y-2 = 0
DELTA = (-4)^2-(-2*1*4)
DELTA = 24
DELTA > 0
y = (24^(1/2)+4)/(1*2) or y = (4-24^(1/2))/(1*2)
y = (2*6^(1/2)+4)/2 or y = (4-2*6^(1/2))/2
y in { (4-2*6^(1/2))/2, (2*6^(1/2)+4)/2 }
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