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