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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
85.8/t = 70.2/9 // - 70.2/9
85.8/t-(70.2/9) = 0
85.8/t-7.8 = 0
85.8*t^-1 = 7.8 // : 85.8
t^-1 = 0.09090909
-1 < 0
1/(t^1) = 0.09090909 // * t^1
1 = 0.09090909*t^1 // : 0.09090909
11.00000011 = t^1
t = 11.00000011
t = 11.00000011
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