According to the mathematics curriculum standard of compulsory education, two properties of the equation are the basis for pupils to solve the equation. Properties of the equation 1: Add or subtract the same number on both sides of the equation, and the left and right sides are still equal. Property 2 of the equation: the two sides of the equation are multiplied by the same number, or divided by the same number that is not 0, and the left and right sides are still equal.