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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
5/t-(3/4) = 6/t // - 6/t
5/t-(6/t)-(3/4) = 0
5/t-6*t^-1-3/4 = 0
-1*t^-1 = 3/4 // : -1
t^-1 = -3/4
-1 < 0
1/(t^1) = -3/4 // * t^1
1 = -3/4*t^1 // : -3/4
-4/3 = t^1
t = -4/3
t = -4/3
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