One-dimensional linear inequality is a basic concept in mathematics, which represents the relationship between an unknown and a constant, where the unknown is once and the constant can be any real number. There are several ways to solve one-dimensional linear inequality:

1. Deformation by addition and subtraction. Move the constant term in the inequality to one side and the unknown term to the other side to get an equivalent inequality.

2. By multiplication and division deformation method. Move the coefficient in the inequality to one side and the constant term to the other side, and get an equivalent inequality.

3. Through the method of image. The unknown in inequality is regarded as a point on the coordinate axis, and the inequality is transformed into a straight line, and then the solution of inequality is judged by observing the position relationship between the straight line and the coordinate axis.

It should be noted that when solving a linear inequality, we should pay attention to the symbols in the inequality and choose the appropriate solution according to the different symbols. At the same time, we should pay attention to the positive and negative coefficients and constants in inequality and the range of unknown values in inequality, which will affect the solution of inequality.