I found a newly released problem book on intermediate and college algebra, with medium and advanced level problems. What it brings new is its structure: it does not only contain the problems and their solutions, but the solver passes through three intermediary stages to the final solution: hints, solving algorithms and proofs, which are separate in the book.

It is listed on Amazon and B&N, but it can be acquired cheaper on publisher's website at www.infarom.com/new_releases.html .

It is titled MATHEMATICS PROBLEMS WITH SEPARATE PROGRESSIVE SOLUTIONS: HINTS, ALGORITHMS, PROOFS. VOLUME 1 - INTERMEDIATE AND COLLEGE ALGEBRA.