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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(6*t^2-(12*t))/t-2 = 0
(6*t^2-12*t)/t-2 = 0
(6*t^2-12*t)/t+(-2*t)/t = 0
6*t^2-12*t-2*t = 0
6*t^2-14*t = 0
6*t^2-14*t = 0
2*t*(3*t-7) = 0
3*t-7 = 0 // + 7
3*t = 7 // : 3
t = 7/3
2*t*(t-7/3) = 0
(2*t*(t-7/3))/t = 0
(2*t*(t-7/3))/t = 0 // * t
2*t*(t-7/3) = 0
( 2*t )
2*t = 0 // : 2
t = 0
( t-7/3 )
t-7/3 = 0 // + 7/3
t = 7/3
t in { 0}
t = 7/3
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