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D( t )
6*t = 0
6*t = 0
6*t = 0
6*t = 0 // : 6
t = 0
t in (-oo:0) U (0:+oo)
6/(6*t) = 0.4 // - 0.4
6/(6*t)-0.4 = 0
1*t^-1 = 0.4 // : 1
t^-1 = 0.4
-1 < 0
1/(t^1) = 0.4 // * t^1
1 = 0.4*t^1 // : 0.4
2.5 = t^1
t = 2.5
t = 2.5
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