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t in (-oo:+oo)
(1/2)*t^7 = 3 // - 3
(1/2)*t^7-3 = 0
1/2*t^7 = 3 // : 1/2
t^7 = 6
t^7 = 6 // ^ 1/7
t = 6^(1/7)
t = 6^(1/7)
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