The answer is 13x-12 f-g is -5x-2 and the domains are all real numbers i believe the multiply is

and divide i'm not sure sorry hope the rest helps though':p
If the total for the bill was the 284 written in then this is the answer as follows
284*0.25=71
Tip = $71.00
So first you would combine the like-terms so you get:

and combine the second like-terms:

now you only have a two step equation and you continue by doing the reciprocal and you add the -1/5 to the 24.8 where you get:
7/9x=24.6
then because the 7/9 is being multiplied by the x and your trying to isolate it you divide it by the 7/9 on both sides and you'll end up getting
x=31.628571429....