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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
306/t-22 = 13 // - 13
306/t-22-13 = 0
306*t^-1 = 35 // : 306
t^-1 = 35/306
-1 < 0
1/(t^1) = 35/306 // * t^1
1 = 35/306*t^1 // : 35/306
306/35 = t^1
t = 306/35
t = 306/35
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