If you locate the PDF, here is the typical structure of Paul Rider’s "College Algebra." Note that editions vary, but the core remains consistent.
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"No, sir. I derived them."
Rider’s book usually provides answers to odd-numbered problems in the back. Do every single one. Algebra is a sport; you cannot learn it by reading. You must work the problems. If you get stuck, look at the answer and reverse-engineer the solution. If you locate the PDF, here is the
Techniques for solving multiple variables simultaneously. If you locate the PDF