Double repeated functions

Algebra Level 1

Let f(x)=2x6f(x) = 2x-6. Find the value of xx for which f2(x)=2f^2(x) = 2.

Note: f2(x)=f(f(x))f^2(x) = f(f(x)), NOT (f(x))2(f(x))^2.

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