VIDEO #1 What is an equation?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/variables/working-equations/definition-equation
VIDEO #2 What is the solution to an equation?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/variables/working-equations/equation-solution-definition
VIDEO #3 What are inverse operations?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/solve-by-addition-subtraction/solve-by-addition/inverse-operations-definition
VIDEO #4 Solving equations with addition?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/solve-by-addition-subtraction/solve-by-addition/word-problem-addition-example
VIDEO #5 Solving equations with subtraction?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/solve-by-addition-subtraction/solve-by-subtraction/subtraction-example
VIDEO #6 Solving equations with multiplication?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/solve-by-multiplication-division/solve-by-multiplication/multiplication-example
VIDEO #7 Solving equations with division?
http://www.virtualnerd.com/pre-algebra/one-two-step-equations/solve-by-multiplication-division/solve-by-division/word-problem-division-example