Hi there!
First you simplify.
Simplified = 9x+(−5)+(−8)+x
Then you combine the like terms.
9x+(−5)+(−8)+x (*-5 and -8 are like terms) (9x and x are like terms)
Combined it's~ (9x+x)+(−5+−8)
Solve and that comes to 10x+−13 which is your answer. :)
Hope this helps.