Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Pennsylvania 4 | Joseph P. Kolter | Democratic | 1982.0 | Re-elected | Joseph P. Kolter (D) 56.8% Jim Kunder (R) 43.2% |
| Pennsylvania 6 | Gus Yatron | Democratic | 1968.0 | Re-elected | Gus Yatron (D) Unopposed |
| Pennsylvania 7 | Robert W. Edgar | Democratic | 1974.0 | Re-elected | Robert W. Edgar (D) 50.1% Curt Weldon (R) 49.9% |
| Pennsylvania 9 | Bud Shuster | Republican | 1972.0 | Re-elected | Bud Shuster (R) 66.5% Nancy Kulp (D) 33.5% |
| Pennsylvania 10 | Joseph M. McDade | Republican | 1962.0 | Re-elected | Joseph M. McDade (R) 77.1% Gene Basalyga (D) 22.9% |
Question:
In which district is Robert W. Edgar the incumbent?
Answer:
Pennsylvania 7