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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
296/740 = 150/t // - 150/t
296/740-(150/t) = 0
296/740-150*t^-1 = 0
-150*t^-1 = -2/5 // : -150
t^-1 = 1/375
-1 < 0
1/(t^1) = 1/375 // * t^1
1 = 1/375*t^1 // : 1/375
375 = t^1
t = 375
t = 375
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