fg(X)=X

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Solution for fg(X)=X equation: 


Simplifying
fg(X) = X

Multiply fg * X
fgX = X

Solving
fgX = X

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'gX'.
f = g-1

Simplifying
f = g-1

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