Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
how many countries sampled with year of publication being 2007 and ranking l.a. (2) being 7th

### Inputs:
table_name: table, columns: ['Index (Year)', 'Author / Editor / Source', 'Year of publication', 'Countries sampled', 'World Ranking (1)', 'Ranking L.A. (2)']

### Response:
SELECT COUNT Countries sampled FROM table WHERE Year of publication = 2007 AND Ranking L.A. (2) = 7th