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t in (-oo:+oo)
45*t^60*(t-(1/4)) = 0
45*t^60*(t-1/4) = 0
( 45*t^60 )
45*t^60 = 0 // : 45
t^60 = 0
t = 0
( t-1/4 )
t-1/4 = 0 // + 1/4
t = 1/4
t in { 0, 1/4 }
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