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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
19.5/t = 13.5/4.5 // - 13.5/4.5
19.5/t-(13.5/4.5) = 0
19.5/t-3 = 0
19.5*t^-1 = 3 // : 19.5
t^-1 = 0.15384615
-1 < 0
1/(t^1) = 0.15384615 // * t^1
1 = 0.15384615*t^1 // : 0.15384615
6.50000016 = t^1
t = 6.50000016
t = 6.50000016
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