Start by distributing on both sides of this inequality.
This gives you 24 - 12x < 6x - 30.
Put your x's together on the left by subtracting 6x from both sides.
This gives you 24 - 18x < -30.
Now subtract 24 from both sides to get -18x < -54.
Now divide both sides by -18 and x > 3.
Remember to switch the direction of the inequality sign
when you divide both sides by a negative number.
I have also graphed it below on the number line.