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WolframAlpha is a very fancy calculator you can essentially plug almost anything into and get a step-by-step guide to solving the equation. I believe it can do much more than that, but that's what most people use it for.
Wolfram is a lot cheaper. One time payment of like 5 bucks and it's been on my phone for years.
Do you have to pay for symbolab? The last time I used was 10 years ago when tutoring a few students. I also paid for Wolfram alpha sometime last year.
ShowSymbolab was free up to about four or five years ago, but good things never last.