f(-x)=4x

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


Simplifying
f(-1x) = 4x

Remove parenthesis around (-1x)
f * -1x = 4x

Reorder the terms for easier multiplication:
-1f * x = 4x

Multiply f * x
-1fx = 4x

Solving
-1fx = 4x

Solving for variable 'f'.

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

Divide each side by '-1x'.
f = -4

Simplifying
f = -4

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