EQUATIONS FOR 1º AND 2º ESO

An introduction to simple linear equations in this URL: http://www.cut-the-knot.org/arithmetic/WProblem.shtml

How to solve equations in these videos

To be solved, many problems must be translated into equations, here are some recommended steeps http://www.algebralab.org/lessons/lesson.aspx?file=Algebra_OneVariableWritingEquations.xml

There are examples to solve.

Solve these equations