The expression can be used in many ways, for example, there is the distributive property.
Distributive property-
7*(6+5)
We would do 7 times 6, and add that to 7 times 5
like it's title, you would distribute the seven to the two numbers.
SO, 42+ 35
that is 77
PEMDAS
You can use pemdas, and the p in pemdas stands for parenthesis, so we add 6+5 first, which is 11.
Then, you times it by 7, which is 77.
I hope this helped!