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For the very basic precalc foundations this one was great: https://www.amazon.com/gp/product/0760706603/.

For easing into higher maths I recommend this one on proofs: https://www.amazon.com/How-Read-Proofs-Introduction-Mathemat....

Also if you're concerned about quality the MAA reviews math books and publishes a basic library list for undergrad maths: https://www.maa.org/press/maa-reviews.

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