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t in (-oo:+oo)
9 = t*((6*t^7)/2) // - t*((6*t^7)/2)
9-(t*((6*t^7)/2)) = 0
9-3*t^8 = 0
-3*t^8 = -9 // : -3
t^8 = 3
t^8 = 3 // ^ 1/8
abs(t) = 3^(1/8)
t = 3^(1/8) or t = -3^(1/8)
t in { 3^(1/8), -3^(1/8) }
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