Answer:
associative property of multiplication
Explanation:
If we have 3 numbers x, y and z the associative property of multiplication says that:
![x (yz) = z (xy) = (xz)y](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ji9dvvithqyph19tsguqg324fzamzaox3s.png)
This means that the result will be the same regardless of the order in which the multiplication takes place.
In this case we have the following equality
![2(xy) = (2x)y](https://img.qammunity.org/2020/formulas/mathematics/middle-school/2gv9jc7nyu120lb9zu229oxgpkf61w3630.png)
Note that the property used is the associative property of multiplication