I just did this through connections academy the same exact problem, but this is how you do it.
You cancel out the +6 near the x because we need to start isolating the variable. So you subtract 6 from both sides:
[tex]4x < - 12[/tex]
Then you isolate the x completely by dividing both sides by 4:
[tex]x < - 3[/tex]
That is your answer :)
