This is a set 5 problems of different types and a few are not easy. All are solved in mind using concepts and techniques such as, pattern discovery, term element reduction technique, dummy variable substitution, abstraction, sum of inverses conversion, strategy of algebraic expression simplification, multiple ways of input use, comparison of like terms, double square root surd simplification, and mathematical reasoning. The Concepts and Techniques, explained with precision and details, form the BASIC SKILLSET for solving harder algebra problems EASILY IN MIND...