Question

Got this question for homework. I don't know how to solve it, got a few more like this so I would like to see how to do it more than the actual answer.

Answer 1

Part 1

Subtracting 5 from both sides yields

$x=f(x)-5$

Part 2

When the output, f(x) is 2, we can substitute that in to obtain

$x=2-5=-3$