28y-16y=12y
hope this helps!
F(1)=18
f(2)=18-2=16
f(3)=16-2=14
f(4)=14-2=12
f(5)=12-2=10
You want to start by subtracting 5 from both sides to get 2/3x=-8/3 then cross multiply to get whole numbers which is 6=-24x then your gonna want to isolate the variable so divide both sides by -24 to get 6/-24=x then you can simplify to x=-1/4