Let the number of textbooks in Li Fang be X; Then the number of books in Wang Ping's class is 3x. Therefore, 3x-8=x+8 is obtained, and x = 8；; 3x=24 .

The following is an introduction to the one-dimensional linear equation:

One-dimensional linear equation refers to an equation with only one unknown number, the highest order of which is 1, and both sides are algebraic expressions. A linear equation with one variable has only one root. One-dimensional linear equation can solve most engineering problems, travel problems, distribution problems, profit and loss problem, integral table problems, telephone billing problems and digital problems.

One-dimensional linear equation can solve most engineering problems, travel problems, distribution problems, profit and loss problem, integral table problems, telephone billing problems and digital problems. If only arithmetic is used, some problems may be extremely complicated and difficult to understand. The establishment of linear equation model will be able to find the equivalence relationship from practical problems and abstract it into a mathematical problem that can be solved by linear equations.

For the above information, please refer to Baidu Encyclopedia-One Yuan Linear Equation.