3x + 12 - 6x < -9 simplify
-3x < -21 divide both sides by -3 and reverse the inequality sign
x > 7
Interval notation : (7, ∞)
I can't show the graphed version...but.....draw a number line with a "open'" dot at x = 7.......from this point, draw an arrow to the right
![cool cool](/img/emoticons/smiley-cool.gif)