f(-1)=3x

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Solution for f(-1)=3x equation: 


Simplifying
f(-1) = 3x

Reorder the terms for easier multiplication:
-1f = 3x

Solving
-1f = 3x

Solving for variable 'f'.

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

Divide each side by '-1'.
f = -3x

Simplifying
f = -3x

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