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z in (-oo:+oo)
z^2 = 32/25 // - 32/25
z^2-(32/25) = 0
z^2-32/25 = 0
1*z^2 = 32/25 // : 1
z^2 = 32/25
z^2 = 32/25 // ^ 1/2
abs(z) = (32/25)^(1/2)
z = (32/25)^(1/2) or z = -(32/25)^(1/2)
z in { (32/25)^(1/2), -(32/25)^(1/2) }
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