1. At the same time, add or subtract the same number on both sides of the equation, and the new equation has the same solution as the original equation.

2. Both sides of the equation are multiplied and divided at the same time and the same number (0 out) is subtracted. The new equation has the same solution as the original equation.

Brief introduction to solving equations

The value of the unknown that makes the left and right sides of the equation equal is called the solution of the equation. The process of solving an equation is called solving an equation. An equation is an equation that must contain an unknown equation.

The process of solving an equation is called solving an equation. An equation is an equation that must contain an unknown equation. An equation is not necessarily an equation, but it must be an equation.

But x is not necessarily placed on the left side of the equation, or there are two x in an equation, so it needs to be solved by simple calculation methods in mathematics. Some formulas have an X on the right, which can be simply calculated in a different position.