Question 562440
Remember PEMDAS- it's the order in which you do things in a problem:

Parentheses
Exponents
Multiply
Divide
Addition
Subtraction

In this case, since you have variables, you can't do what's in the parentheses first (n-5) so start with the multiplication.

Multiply 2 out to everything in the parentheses ( 2(n-5) is really 2(n)-2(5))

2(n-5)+n
2(n)-2(5)+n
2n-10+n

combine all the like statements (2n+n)

the final answer is 3n-10