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x in (-oo:+oo)
x^2-(164/3200) = 0
x^2-41/800 = 0
1*x^2 = 41/800 // : 1
x^2 = 41/800
x^2 = 41/800 // ^ 1/2
abs(x) = (41/800)^(1/2)
x = (41/800)^(1/2) or x = -(41/800)^(1/2)
x in { (41/800)^(1/2), -(41/800)^(1/2) }
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