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t in (-oo:+oo)
(1/64)*t^3 = t // - t
(1/64)*t^3-t = 0
1/64*t^3-t = 0
t*(1/64*t^2-1) = 0
1/64*t^2 = 1 // : 1/64
t^2 = 64
t^2 = 64 // ^ 1/2
abs(t) = 8
t = 8 or t = -8
t = 0
t = 0
t in { 8, -8, 0 }
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