Answer:
-x + 13
Step-by-step explanation:
x - 2x + 13 =
Combine like terms, x and -2x.
= -x + 13
13-x
x-2x can alsso mean x(1-2). (1-2)=(-1). So x(-1)=-x.
So now you have -x+13, or to make it shorter, 13-x.
