Let the number of negative fields be x and the number of tied fields be (x+3) (because the number of negative fields is three less than the number of tied fields).

The winning number is (7-2x) (* * 10 field, that is, 10-x-(x+3)).

So equation 3(7-2x)+(x+3)= 19.

x= 1

So 7-2x=5.

The football team won five games in this league.