Right around here, in like 7th or 8th grade when they start teaching algebra instead of just arithmetic, is where math class goes wrong.
They teach the class as if every student is going to be a mathematician and fill chalkboards with a bunch of greek letters to prove that E = MChammer or whatever the hell they actually do. They expect tweenagers to take on board six or seven phrases like the Transitive Property of Equality, learn the definitions of them, and then remember which definition goes to which bullshit made up to look smart phrase that definition went with.
The result? Arguments on the internet over the simplification of syntactically ambiguous polynomials, because teaching it as PEMDAS kind of misses the point.
I use order of operations all the time in my day to day life; for example, right now on my workbench is a drawer box waiting for the glue to dry. It’s 10 7/8" wide. The sides are 5/8" thick. The back is set into a 1/4" deep dado on each side. The length of the back board is overall_width - 2 * (side_thickness - dado_depth). The back board is 10 1/8" long. That’s how I programmed my CAD software to create it
You need a #1 phillips, a #0 phillips, a soldering iron and accoutrements for desoldering and soldering 3 through-hole joints. There’s a screw under the sticker in the battery compartment; there are no clips holding the outer shell together, if it doesn’t fall apart under gravity there’s another screw somewhere.
Note the replacements will likely fail eventually too if you replace it with the same part number switch; there is a more appropriate switch for the task but don’t ask for the part number off the top of my head.