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z in (-oo:+oo)
1/16-(16*z^2) = 0
1/16-16*z^2 = 0
-16*z^2 = -1/16 // : -16
z^2 = 1/256
z^2 = 1/256 // ^ 1/2
abs(z) = 1/16
z = 1/16 or z = -1/16
z in { 1/16, -1/16 }
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