f(4a)=x-9

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Solution for f(4a)=x-9 equation: 


Simplifying
f(4a) = x + -9

Remove parenthesis around (4a)
f * 4a = x + -9

Reorder the terms for easier multiplication:
4f * a = x + -9

Multiply f * a
4af = x + -9

Reorder the terms:
4af = -9 + x

Solving
4af = -9 + x

Solving for variable 'a'.

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

Divide each side by '4f'.
a = -2.25f-1 + 0.25f-1x

Simplifying
a = -2.25f-1 + 0.25f-1x

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