A math problem in grade six. For the topic, please see the supplementary question. Please write down the process and ideas of solving the problem.

Hello, landlord.

This problem should be solved by the idea of equation.

First, there are X trolleys, each with 65 people, and the total number of people is 65X+5.

If there are 5 people in each car, that is, 65+5=70 people in each car, the total number of people is 70 (X- 1).

The total number of people is unchanged, so the countable equation is 65X+5=(65+5)(X- 1).

To solve this equation, 65x+5=70x-70.

75 = 5 times

x= 15

The total number of people is 65× 15+5=980 (or 70×( 15- 1)).

A: The total number is 980.