Key to Algebra, Book 1: Operations on Integers; Book 2: Variables, Terms and Expressions; Book 3: Equations; Book 4: Polynomials; Book 5: Rational Numbers; Book 6: Multiplying and Dividing Rational Expressions; Book 7: Adding and Subtracting Rational Expressions; Answers and Notes for Books 1–4; Answers and Notes for Books 5–7

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