Answer
$t = 3, 9$
Work Step by Step
$|2t-12| = 6$
$2t-12 = 6$
$2t = 6 + 12$
$2t = 18$
$t = 9$
$-(2t-12) = 6$
$-2t + 12 = 6$
$-2t = 6 -12$
$-2t = -6$
$2t = 6$
$t = 3$
$t = 3, 9$
Check:
When $t = 3$
$|2(3)-12| \overset{?}{=} 6$
$|6-12| \overset{?}{=} 6$
$|-6| \overset{?}{=} 6$
$6 = 6$
When $t = 9$
$|2(9)-12| \overset{?}{=} 6$
$|18-12| \overset{?}{=} 6$
$|6| \overset{?}{=} 6$
$6 = 6$