Answer:
The given calculation is 9x8-5-2. To make this equal to 25, we can add brackets like this: 9x(8-5)-2. Here's how it works:
1. Calculate the expression in the brackets first: 8-5 = 3.
2. Then multiply 9x3 = 27.
3. Finally, subtract 2 from 27 to get 25.
So, 9x(8-5)-2 = 25. This is due to the order of operations in mathematics, often remembered by the acronym PEMDAS which stands for Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).