f(x)+f(2x)=3x

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Solution for f(x)+f(2x)=3x equation: 


Simplifying
f(x) + f(2x) = 3x

Multiply f * x
fx + f(2x) = 3x

Remove parenthesis around (2x)
fx + f * 2x = 3x

Reorder the terms for easier multiplication:
fx + 2f * x = 3x

Multiply f * x
fx + 2fx = 3x

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

Solving
3fx = 3x

Solving for variable 'f'.

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

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

Simplifying
f = 1

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