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x in (-oo:+oo)
(3/4)*x^12 = 120 // - 120
(3/4)*x^12-120 = 0
3/4*x^12 = 120 // : 3/4
x^12 = 160
x^12 = 160 // ^ 1/12
abs(x) = 160^(1/12)
x = 160^(1/12) or x = -160^(1/12)
x in { 160^(1/12), -160^(1/12) }
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