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t in (-oo:+oo)
(t^4)/20000 = 52.4288 // - 52.4288
(t^4)/20000-52.4288 = 0
1/20000*t^4 = 52.4288 // : 1/20000
t^4 = 1048576
t^4 = 1048576 // ^ 1/4
abs(t) = 32
t = 32 or t = -32
t in { 32, -32 }
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