The five problems with a few difficult ones are solved in mind using special concepts and techniques explained with precision and details. Important concepts used are property of sum of inverses, inversion technique, focus on how to use given value, collection of like terms, three variable sum of cubes expansion, and mathematical reasoning. Solution of two large problems seemed to be time taking, but with analytical strategic approach both are solved just in a few steps. The Concepts and Techniques form the BASIC SKILLSET for solving harder algebra problems EASILY IN MIND...