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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
7/3 = 4/t // - 4/t
7/3-(4/t) = 0
7/3-4*t^-1 = 0
-4*t^-1 = -7/3 // : -4
t^-1 = 7/12
-1 < 0
1/(t^1) = 7/12 // * t^1
1 = 7/12*t^1 // : 7/12
12/7 = t^1
t = 12/7
t = 12/7
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