Python output question def f(x)

Question

So lost on this one, Indiana Jones couldn't help me.

def f(x):
return (2*x+1)
def g(x):
return(x-1)
print(g(f(2))-f(g(2))

Output: 1

(2*-1)+1=5
(2*2)+1=5
5-5=0

So why is the answer 1?

Answer 1

f(2) == 2*2 + 1 == 5.
g(f(2)) == g(5) == 5 - 1 == 4.

g(2) == 2 - 1 == 1.
f(g(2)) == f(1) == 2*1 + 1 == 3.

g(f(2)) - f(g(2)) == 4 - 3 == 1.