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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
306/t-21 = 13 // - 13
306/t-21-13 = 0
306*t^-1 = 34 // : 306
t^-1 = 1/9
-1 < 0
1/(t^1) = 1/9 // * t^1
1 = 1/9*t^1 // : 1/9
9 = t^1
t = 9
t = 9
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