1. For general equations, if a is added to the equation, when solving by using the properties of the equation, a must be subtracted from both sides of the equation. Similarly, if a is used to subtract the equation, one will be added to both sides of the equation when solving it by using the properties of the equation. Multiplication and division are the same. In other words, addition, subtraction, multiplication and division are opposites, and addition, subtraction, multiplication and division are concrete numbers. To sum up, the general equation is very simple, and the specific numbers will be given to you. Addition, subtraction, multiplication and division should be the other way around.
2. For a special equation, both subtraction and division are unknowns X. When solving, subtract the unknowns, then add the unknowns, divide them by the unknowns, and then multiply them by the unknowns, with opposite signs, so that the equation can be transformed into a general equation. To sum up, don't be confused by special equations, do subtraction and division with unknowns, and multiplication will become general.
3. For the slightly complicated equation, the method of "keeping a distance from the unknown X" is adopted, that is, the ones far from the unknown X are removed first, and the ones far from the unknown X are regarded as a whole. Through transformation, the equation becomes simple and clear at a glance. To sum up, if it's a little complicated, it's easy to get out.