f(-3x)+f(x)=x

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


Simplifying
f(-3x) + f(x) = x

Remove parenthesis around (-3x)
f * -3x + f(x) = x

Reorder the terms for easier multiplication:
-3f * x + f(x) = x

Multiply f * x
-3fx + f(x) = x

Multiply f * x
-3fx + fx = x

Combine like terms: -3fx + fx = -2fx
-2fx = x

Solving
-2fx = x

Solving for variable 'f'.

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

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

Simplifying
f = -0.5

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