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