f(9a)=x+7

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Solution for f(9a)=x+7 equation: 


Simplifying
f(9a) = x + 7

Remove parenthesis around (9a)
f * 9a = x + 7

Reorder the terms for easier multiplication:
9f * a = x + 7

Multiply f * a
9af = x + 7

Reorder the terms:
9af = 7 + x

Solving
9af = 7 + 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 = 0.7777777778f-1 + 0.1111111111f-1x

Simplifying
a = 0.7777777778f-1 + 0.1111111111f-1x

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