f(a)=x

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Solution for f(a)=x equation: 


Simplifying
f(a) = x

Multiply f * a
af = x

Solving
af = x

Solving for variable 'a'.

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

Divide each side by 'f'.
a = f-1x

Simplifying
a = f-1x

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