hgfh \circ g \circ f

Algebra Level 1

f(x)=3x+6f(x)=3x+6 and g(x)g(x) satisfies the following for all functions h(x):h(x):

(hgf)(x)=h(x).(h \circ g \circ f)(x)=h(x).

What is the value of g(18)?g(18)?

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