The answer process is as follows:

(1) X tube is installed.

(2) According to * * *, there are 1428 tennis balls, and every five tennis balls are packed in a bucket, and there are three tennis balls left after loading. The equation can be listed as 5x+3= 1428.

(3) Simplify to get 5x= 1425, and divide both sides of the equation by 5 at the same time to get x=285.

(4) So there are 1428 tennis balls, and a * * * contains 285 drums.

Extended data

Reflections on solving compound application problems;

1, understanding the meaning of the question is to find out the known conditions and requirements in the application question.

2. Analyzing the quantitative relationship means analyzing the relationship between known quantity and unknown quantity, known quantity and unknown quantity, finding a solution to the problem, and determining what is first, then what is best.

3, column solution, that is, according to the analysis, list the formula and calculate.

4. Check the calculation, give the answer, that is, check whether the solution process is reasonable, whether the result is correct, whether it is consistent with the original question, and finally write the answer.