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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
13/t = 39/6.6 // - 39/6.6
13/t-(39/6.6) = 0
13/t-5.90909091 = 0
13*t^-1 = 5.90909091 // : 13
t^-1 = 0.45454545
-1 < 0
1/(t^1) = 0.45454545 // * t^1
1 = 0.45454545*t^1 // : 0.45454545
2.20000002 = t^1
t = 2.20000002
t = 2.20000002
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