It's 48. Even I got it.
You have to break it up and things.
We'd started out with (6g - 3h), alright? Now, switch the letters with the numbers. You should have (6 x 5 - 3 x 4). (I added multiplicatio sign thinges in there so it's easier to read.) ALWAYS DO YOUR MULTIPLYING OR DIVIDNG FIRST. So, you start from the left, and you say 6 x 5 = 30, and 3 x 4 = 12. So, it's now 30 - 1, which, is simple. It's 18. Now that you've got 18 for the left side, all you need to do is get the right side taken care of. (2g + 5h), which, if you change the letters CORRECTLY would be 2 x 5 + 5 x 4. 2 x 5 = 10 and 5 x 4 = 20. What's 10 + 20? It's 30. Then, you get the 18 back, and add, 30 + 18, which is where you get your answer, 48[/u].