(8.9-5.6) -7/9

To solve this expression, we will follow the order of operations, which is parentheses, exponents, multiplication/division (from left to right), and addition/subtraction (from left to right).

First, let's simplify the expression inside the parentheses:

(8.9 - 5.6) - 7/9 = 3.3 - 7/9

Next, we will find a common denominator for subtracting the fractions:

3.3 - 7/9 = 3.3 - (7/9 * 9/9) = 3.3 - 63/81

Now, subtract the fractions:

3.3 - 63/81 = (3.3 * 81/81) - 63/81 = 267.3/81 - 63/81

Finally, subtract the fractions:

267.3/81 - 63/81 = (267.3 - 63)/81 = 204.3/81

So, the result is 204.3/81.