Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_42082 ( "Team" text, "Tries for" real, "Tries against" real, "Try diff" text, "Points for" real, "Points against" real, "Points diff" text )

### Question ###
How many Tries against has a Try diff of 17 and Points for smaller than 80?

### Accurate SQL ###

SELECT COUNT("Tries against") FROM table_42082 WHERE "Try diff" = '–17' AND "Points for" < '80'