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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4000 = 60000/t-11 // - 60000/t-11
11-(60000/t)+4000 = 0
11-60000*t^-1+4000 = 0
-60000*t^-1 = -4011 // : -60000
t^-1 = 1337/20000
-1 < 0
1/(t^1) = 1337/20000 // * t^1
1 = 1337/20000*t^1 // : 1337/20000
20000/1337 = t^1
t = 20000/1337
t = 20000/1337
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