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x in (-oo:+oo)
864 = (1/2)*x^64 // - (1/2)*x^64
864-((1/2)*x^64) = 0
(-1/2)*x^64+864 = 0
-1/2*x^64 = -864 // : -1/2
x^64 = 1728
x^64 = 1728 // ^ 1/64
abs(x) = 1728^(1/64)
x = 1728^(1/64) or x = -1728^(1/64)
x in { 1728^(1/64), -1728^(1/64) }
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