Given f(x)=7-2x find f (x+5)

Question

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.

Answer 1

f(x)=7-2x

In f(x+5) you have replaced the x with x+5, so do the same thing on the right side

f(x+5) = 7 - 2(x+5)
= 7 - 2x - 10
= -3 - 2x <-----> same as 7-(2x+10) , you had it

Answer 2

Oh. Thank you so much! I am glad that you helped.