f(3)=12+3x

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Solution for f(3)=12+3x equation: 


Simplifying
f(3) = 12 + 3x

Reorder the terms for easier multiplication:
3f = 12 + 3x

Solving
3f = 12 + 3x

Solving for variable 'f'.

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

Divide each side by '3'.
f = 4 + x

Simplifying
f = 4 + x

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