g(x)=f(-x)

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


Simplifying
g(x) = f(-1x)

Multiply g * x
gx = f(-1x)

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

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

Multiply f * x
gx = -1fx

Solving
gx = -1fx

Solving for variable 'g'.

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

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

Simplifying
g = -1f

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