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D( t )
3*t-2 = 0
(3*t-2)^2 = 0
3*t-2 = 0
3*t-2 = 0
3*t-2 = 0 // + 2
3*t = 2 // : 3
t = 2/3
(3*t-2)^2 = 0
(3*t-2)^2 = 0
3*t-2 = 0 // + 2
3*t = 2 // : 3
t = 2/3
t in (-oo:2/3) U (2/3:+oo)
2/(3*t-2)+1 = 8/((3*t-2)^2) // - 8/((3*t-2)^2)
2/(3*t-2)-(8/((3*t-2)^2))+1 = 0
2/(3*t-2)-8*(3*t-2)^-2+1 = 0
2/(3*t-2)-8/((3*t-2)^2)+1 = 0
(2*(3*t-2))/((3*t-2)^2)-8/((3*t-2)^2)+(1*(3*t-2)^2)/((3*t-2)^2) = 0
2*(3*t-2)+1*(3*t-2)^2-8 = 0
9*t^2+6*t-12*t-12+4 = 0
9*t^2-6*t-8 = 0
9*t^2-6*t-8 = 0
9*t^2-6*t-8 = 0
DELTA = (-6)^2-(-8*4*9)
DELTA = 324
DELTA > 0
t = (324^(1/2)+6)/(2*9) or t = (6-324^(1/2))/(2*9)
t = 4/3 or t = -2/3
(t+2/3)*(t-4/3) = 0
((t+2/3)*(t-4/3))/((3*t-2)^2) = 0
((t+2/3)*(t-4/3))/((3*t-2)^2) = 0 // * (3*t-2)^2
(t+2/3)*(t-4/3) = 0
( t+2/3 )
t+2/3 = 0 // - 2/3
t = -2/3
( t-4/3 )
t-4/3 = 0 // + 4/3
t = 4/3
t in { -2/3, 4/3 }
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