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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8/t-(3/t)-7 = 0
8/t-3*t^-1-7 = 0
5*t^-1 = 7 // : 5
t^-1 = 7/5
-1 < 0
1/(t^1) = 7/5 // * t^1
1 = 7/5*t^1 // : 7/5
5/7 = t^1
t = 5/7
t = 5/7
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