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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
225/t-4 = 64 // - 64
225/t-64-4 = 0
225*t^-1 = 68 // : 225
t^-1 = 68/225
-1 < 0
1/(t^1) = 68/225 // * t^1
1 = 68/225*t^1 // : 68/225
225/68 = t^1
t = 225/68
t = 225/68
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