Answer: x
Explanation:
The shortcut: f⁻¹ and f cancel each other out. So you are left with x
The long way:
f(x) = 47x - 55
f⁻¹(x) is when the x's and y's are swapped and you solve for y
x = 47y - 55
x + 55 = 47y
= y
f⁻¹(x) =
f⁻¹(f(x)) =
=
= x
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= y 
