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y in (-oo:+oo)
y^2-((16/2)*y) = 0
y^2-8*y = 0
y^2-8*y = 0
DELTA = (-8)^2-(0*1*4)
DELTA = 64
DELTA > 0
y = (64^(1/2)+8)/(1*2) or y = (8-64^(1/2))/(1*2)
y = 8 or y = 0
y in { 0, 8 }
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