Given f(x)=7-2x find f (x+5)  

I'm not sure how to approach this problem.  
I have done this so far:  
F(x+5) = 7-2x  
F(x+5)=7-2(x+5)  
F(x+5)=7-(2x+10)  
Not sure if this is right and what to do next.

2 answers

Ms.sue may you help me? A user named Cory is keep on bothering me. Every time I post this question, Cory harasses by saying they know the answer and they aren't going to tell me. I need help with this issue and also with this math problem. Thank you for your time and effort
Sarah, I did this for you here

http://www.jiskha.com/display.cgi?id=1489951802

I also do not see any posts by Cory, so it looks like Ms Sue has taken care of it, and banned him.