Question

X+5 is either

x,y,f(y)
.
Y+5 is either
x,y,f(x)
.
Y is either
x-5,x+5,y-5
.
X-5 is either
x,g(x),g(y)

Answer 1

First step

y = x + 5

Second step

x = y + 5

Next step

x - 5 = y

Last step

y = x - 5

Hope this helps you.