1. Understanding the problem: First of all, we need to clearly understand the problem to be solved, and make clear the unknown and known numbers, as well as their relationship.

2. Define variables: select an unknown number and express it in letters. For example, we can choose x as the unknown.

3. Establish an equation: According to the relationship of the problem, establish an equation containing the unknown and the known number, which is the equation. For example, given that X plus 5 equals 10, we can write x+5= 10.

4. Solving the equation: Solving the equation is to find the value of x and make the equation hold. There are many methods to solve this equation, such as substitution method, elimination method and formula method.

5. Integrate the answers: Finally, we need to check whether the results are correct and integrate the answers. If the solved x value satisfies the equation, then the answer is correct. If the value of x does not satisfy the equation, then we should reconsider the problem, or re-select the unknown and known numbers and re-establish the equation.

The history of simple equations:

The history of simple equations can be traced back to ancient civilization. As early as in ancient Egypt and Mesopotamia, people began to use simple algebraic equations to solve practical problems.

In China, as early as the Spring and Autumn Period and the Warring States Period, mathematicians began to study equations and used "calculation" to operate, which solved many practical problems. In Europe, Diophantine, an ancient Greek mathematician, also began to study algebraic equations and put forward some solutions.

In medieval Europe, algebra became an important subject. In his book Algebra, Arab mathematician Hua Lazimi gave the solutions of the first and second equations for the first time and systematically expounded algebra. Since then, European mathematicians have begun to study equations more deeply and gradually formed the foundation of modern algebra.

In modern times, with the development of mathematics, the application scope of simple equations is more and more extensive. In physics, chemistry, engineering, economy and other fields, simple equations are needed to describe and solve practical problems. At the same time, with the development of computer technology, solving equations becomes easier and more efficient.