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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/t+7 = 5/(-8) // - 5/(-8)
3/t-(5/(-8))+7 = 0
3/t+5/8+7 = 0
3*t^-1 = -61/8 // : 3
t^-1 = -61/24
-1 < 0
1/(t^1) = -61/24 // * t^1
1 = -61/24*t^1 // : -61/24
-24/61 = t^1
t = -24/61
t = -24/61
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