You have to carefully move things from one side to the other, you start with:

1. Add 2 to both sides:

2. Divide both sides by 3:

3. Subtract 12 from both sides:

Now, here's the hard part:

4. Divide both sides by -1 and FLIP the less than or equal symbol to be greater than or equal to. Whenever you divide or multiply by a negative number, you flip the inequality:

And that's your answer.