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Try to describe the steps of establishing mathematical model by linear programming.
Answer: Linear programming refers to the method of solving the maximum or minimum value of linear objective function under the constraint of linear equality or inequality. The steps of establishing a mathematical model for linear programming are as follows:

(1) Determine the variables that affect the target;

(2) List the objective function equation;

(3) Find out the restrictive factors to achieve the goal;

(4) Find the feasible solution that makes the objective function optimal, that is, the optimal solution of linear programming.