Reddit reviews Schaum's Outline of Review of Elementary Mathematics, 2nd Edition (Schaum's Outlines)

You can graph the function and find where it equals zero.

Or learn some basic algrebra.

I think the TI-83 by design does not have an algebra solver. Most middle/high school math teachers wouldn't want them in the classroom if it did. The Ti-89 which is targeted towards engineers does.

If you want to learn the mathematics behind games of chance I would seriously look at brushing up on algebra.

Ah, you say something like "Algebra" on /r/askacademia people are going to assume you mean like graduate level pure math.

I think the first step for someone with your background is to just get comfortable with basic arithmetic and numbers again. At least I've found when trying to teach people without a strong math background that before you can get to things like algebra you have to instill a sort of "trust" in calculation. I think the best way to do that is probably repetition, repetition, repetition. Perhaps something like this:

http://www.amazon.com/Schaums-Outline-Elementary-Mathematics-Outlines/dp/007176254X/ref=sr_1_1?ie=UTF8&qid=1458739566&sr=8-1&keywords=schaum%27s+arithmetic

And do the shit out of the problems. That is absolutely crucial. Do them until they're second nature, move to the next section, then the next and then a couple weeks later COME BACK and always be mixing it up but pushing forward.

http://www.amazon.com/Schaums-Outline-Elementary-Mathematics-Outlines/dp/007176254X och khanacademy ifall engelskan inte är något problem.
Annars, har du kollat på https://www.youtube.com/user/MikaelBondestam ?

Sometimes it's nice to have a ton of worked examples, so you can get to the point where you don't even have to think about what to do next-- it'll be muscle memory.

The best thing I've found for that is Schaum's Outlines. Here's the one for Elementary Math, which I think has fractions in it. It'll give you a quick, clear explanation of the rules of the process and then give you tons of problems and all the problems have answers in the back, with all the steps worked out. They're only like $15, too, and there are ones for pretty much every subject in math and a lot of science.

I like Khan Academy, but there are never enough problems. It just gets you to the point where you understand the concept, but have to work hard to remember the topic when you need to use it. That's not very helpful for tests or in practice.

Good luck!