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z in (-oo:+oo)
1 = (z^12)/4 // - (z^12)/4
1-((z^12)/4) = 0
-1/4*z^12 = -1 // : -1/4
z^12 = 4
z^12 = 4 // ^ 1/12
abs(z) = 4^(1/12)
z = 4^(1/12) or z = -4^(1/12)
z in { 4^(1/12), -4^(1/12) }
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