f(9a)=x+9

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Solution for f(9a)=x+9 equation: 


Simplifying
f(9a) = x + 9

Remove parenthesis around (9a)
f * 9a = x + 9

Reorder the terms for easier multiplication:
9f * a = x + 9

Multiply f * a
9af = x + 9

Reorder the terms:
9af = 9 + x

Solving
9af = 9 + x

Solving for variable 'a'.

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

Divide each side by '9f'.
a = f-1 + 0.1111111111f-1x

Simplifying
a = f-1 + 0.1111111111f-1x

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