Subtract 2x from both sides:



Add 2 to both sides:



Divide both sides by -2.  Since this is
dividing both sides by a negative number,
the inequality symbol must be reversed:



Graph on a number line with a darkened circle
at 9 because it's , not .

<=================================☻------------------
-2 -1  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14

The interval notation is an abbreviation of the graph
on a number line. The darkened circle is denoted by "]"
and the rightmost point of the interval is 9, and the
interval goes to negative infinity on the left side, so 
the interval notation is

         

Edwin