Answer:
2x - 9
Step-by-step explanation:
7x - (9 + 5x) < distribute the - into the parentheses to get rid of them
7x - 9 - 5x < combine like terms
7x - 5x = 2x
-9 stays as it is as there are no other terms to combine it with
the answer is 2x - 9
The greatest common factor of those numbers is 8.
The answer is 3
Add all numbers (21) then divide by 7 (there are seven numbers there)
So the answe is 3