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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/t+(2*t)/t+3 = 2 // - 2
3/t+(2*t)/t-2+3 = 0
3*t^-1 = -3 // : 3
t^-1 = -1
-1 < 0
1/(t^1) = -1 // * t^1
1 = -1*t^1 // : -1
-1 = t^1
t = -1
t = -1
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