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y in (-oo:+oo)
2*y^2-((5/4)*y) = 1/2 // - 1/2
2*y^2-((5/4)*y)-(1/2) = 0
2*y^2+(-5/4)*y-1/2 = 0
2*y^2-5/4*y-1/2 = 0
DELTA = (-5/4)^2-(-1/2*2*4)
DELTA = 89/16
DELTA > 0
y = ((89/16)^(1/2)+5/4)/(2*2) or y = (5/4-(89/16)^(1/2))/(2*2)
y = ((89/16)^(1/2)+5/4)/4 or y = (5/4-(89/16)^(1/2))/4
y in { (5/4-(89/16)^(1/2))/4, ((89/16)^(1/2)+5/4)/4 }
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