tolong bantu jawab please

f(x) = (x - 1)/x
xy = x - 1
x(y - 1) = -1
x = 1/(1 - y)
f⁻¹(x) = 1/(1 - y)
g(x) = x + 3
y = x + 3
x = y - 3
g⁻¹(x) = x - 3
ditanya (g(f(x)))⁻¹ = f⁻¹(g⁻¹(x))
                            = f⁻¹(x - 3)
                            = 1/(1 - (x - 3)
                            = 1/(4 - x)