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y in (-oo:+oo)
2*y^2-((50/2)*y)+10 = 0
2*y^2-25*y+10 = 0
2*y^2-25*y+10 = 0
DELTA = (-25)^2-(2*4*10)
DELTA = 545
DELTA > 0
y = (545^(1/2)+25)/(2*2) or y = (25-545^(1/2))/(2*2)
y = (545^(1/2)+25)/4 or y = (25-545^(1/2))/4
y in { (25-545^(1/2))/4, (545^(1/2)+25)/4 }
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