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x in (-oo:+oo)
0 = (1/3)*x^12-4 // - (1/3)*x^12-4
0-((1/3)*x^12)+4 = 0
(-1/3)*x^12+0+4 = 0
-1/3*x^12 = -4 // : -1/3
x^12 = 12
x^12 = 12 // ^ 1/12
abs(x) = 12^(1/12)
x = 12^(1/12) or x = -12^(1/12)
x in { 12^(1/12), -12^(1/12) }
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