f(-2)=x

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Solution for f(-2)=x equation: 


Simplifying
f(-2) = x

Reorder the terms for easier multiplication:
-2f = x

Solving
-2f = x

Solving for variable 'f'.

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

Divide each side by '-2'.
f = -0.5x

Simplifying
f = -0.5x

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