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20 13 Haidian senior high school entrance examination is a model of mathematics
My thinking on this issue is like this.

Step 1: Establish a rectangular coordinate system with point C as the origin of the coordinate axis, and calculate the coordinates of point AB as (-3,0) (4,0) respectively.

Step 2: Find the coordinates of point P and point Q and the midpoint coordinates of PQ with unknown numbers, and then find the linear equation of PQ.

Then find the DE linear equation.

Step 3: Establish an equivalent equation according to the relationship between two vertical straight lines, and find out the unknowns that satisfy the meaning of the question.

If you are interested in this method, you can hi me and we can communicate together.