Property 1, adding the same number (or formula) on both sides of the equation still leads to the equation;

Real estate 2. Both sides of an equation are multiplied by the same number or divided by a non-zero number, and the result is still an equation.

(2) Using the properties of the equation to solve the equation.

Using the properties of the equation, the equation is transformed into the form of x = a.

Pay attention to two aspects when applying:

① How to deform;

According to which one, the correct deformation can be guaranteed by reasonable evidence step by step.