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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
12.6-(12/t) = 10.2 // - 10.2
12.6-(12/t)-10.2 = 0
12.6-12*t^-1-10.2 = 0
-12*t^-1 = -2.4 // : -12
t^-1 = 0.2
-1 < 0
1/(t^1) = 0.2 // * t^1
1 = 0.2*t^1 // : 0.2
5 = t^1
t = 5
t = 5
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