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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6/t+4 = 42/77 // - 42/77
6/t-(42/77)+4 = 0
6/t-6/11+4 = 0
6*t^-1 = -38/11 // : 6
t^-1 = -19/33
-1 < 0
1/(t^1) = -19/33 // * t^1
1 = -19/33*t^1 // : -19/33
-33/19 = t^1
t = -33/19
t = -33/19
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