Question 620671
<pre>
|3x+1| - 1 < 2
       + 1  +1
---------------
|3x+1|    < 3

-3 < 3x+1 < 3
-1     -1  -1
-------------
-4 < 3x   < 2

{{{-4/3}}} < x < {{{2/3}}}

Edwin</pre>