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$h \circ g \circ f$

Algebra Level 1

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

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

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

3 4 5 6

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by Mahindra Jain

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