I love a brain teaser, but this one got me.
I thought I had it solved. I thought the "trick" was the multiplication in the final line with the order of operation.
Well, that's only part of it. There are four other nuances that make this trickier than most.
See if you can figure it out. You'll need to pause the video a few seconds in, so you can take time to solve it.
Good luck. This one is fun.