This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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Purplemath
purplemath.com
did:plc:lnawejsv75ehjctmbqop6m6k
Purplemath is a free algebra lessons website. The author, Elizabeth Aran (Stapel), always had trouble with math, so her lessons are where you go when the book and the instructor aren't making any sense. As she says, "If I can do this, so can you!"