2,5 - (-6/9) = 2,5 + 6/9

To add these two numbers, we need to find a common denominator. The least common multiple of 9 and 1 is 9.

2,5 + 6/9 = (2,5 * 9/9) + 6/9

= 22,5/9 + 6/9

Now that we have a common denominator, we can add the numerators:

= (22,5 + 6)/9

= 28,5/9

So, 2,5 - (-6/9) = 28,5/9