Sudoku Medium 3

The third Sudoku puzzle is also partially filled. The visible numbers are: 6, 3, 7; 3, 4, 9, 5, 1, 2; 6, 5, 1; 3, 8, 9, 7; 1, 3; 2, 3, 1, 7; 6, 9; 5, 2; 8, 2, 4, 7.