Well, darling, first you multiply 13 by 4 to get 52. Then you divide 72 by 8 to get 9. Finally, you subtract 9 from 52 to get 43. So, the answer is 43. Math can be a real hoot, can't it?
Oh, dude, let's break it down. First, you do 13 multiplied by 4, which equals 52. Then, you subtract 72 from that, giving you -20. Finally, you divide -20 by 8, and you get -2.5. Ta-da! Math magic.