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Z in (-oo:+oo)
Z^2 = 1/25 // - 1/25
Z^2-(1/25) = 0
Z^2-1/25 = 0
1*Z^2 = 1/25 // : 1
Z^2 = 1/25
Z^2 = 1/25 // ^ 1/2
abs(Z) = 1/5
Z = 1/5 or Z = -1/5
Z in { 1/5, -1/5 }
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