9*9-28/7

To solve the expression 9 * 9 - 28 / 7, you should follow the order of operations, which is often abbreviated as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right).

1. First, perform the multiplication: 9 * 9 = 81.
2. Then, perform the division: 28 / 7 = 4.
3. Finally, subtract the result of the division from the result of the multiplication: 81 - 4 = 77.

Therefore, the solution to the expression 9 * 9 - 28 / 7 is 77.