f(3a)=x-4

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Solution for f(3a)=x-4 equation: 


Simplifying
f(3a) = x + -4

Remove parenthesis around (3a)
f * 3a = x + -4

Reorder the terms for easier multiplication:
3f * a = x + -4

Multiply f * a
3af = x + -4

Reorder the terms:
3af = -4 + x

Solving
3af = -4 + x

Solving for variable 'a'.

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

Divide each side by '3f'.
a = -1.333333333f-1 + 0.3333333333f-1x

Simplifying
a = -1.333333333f-1 + 0.3333333333f-1x

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