ok so f(x) and g(x) are the same thing as y. this means that you can solve these equations the same as any other multi-step equation. the only difference is if they have a number other than x in the parentheses. if they have a number you will just replace the x’s in the equation with the number in the parentheses.
example:
regular equation equation with f(4)
f(x)=2x+1 f(4)=2(4)+1
make sure to use pemdas :)