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D( t )
3*t-1 = 0
3*t-1 = 0
3*t-1 = 0
3*t-1 = 0 // + 1
3*t = 1 // : 3
t = 1/3
t in (-oo:1/3) U (1/3:+oo)
5/(3*t-1) < 2 // - 2
5/(3*t-1)-2 < 0
5/(3*t-1)+(-2*(3*t-1))/(3*t-1) < 0
5-2*(3*t-1) < 0
7-6*t < 0
(7-6*t)/(3*t-1) < 0
(7-6*t)/(3*t-1) < 0 // * (3*t-1)^2
(7-6*t)*(3*t-1) < 0
( 3*t-1 )
3*t-1 < 0 // + 1
3*t < 1 // : 3
t < 1/3
( 7-6*t )
7-6*t < 0 // - 7
-6*t < -7 // : -6
t > -7/(-6)
t > 7/6
(-oo:1/3) (1/3:7/6) (7/6:+oo) 3*t-1 - + + 7-6*t + + -
t in (-oo:1/3) U (7/6:+oo)
(-oo:1/3) U (7/6:+oo)
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