f(4)=4f

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Solution for f(4)=4f equation: 


Simplifying
f(4) = 4f

Reorder the terms for easier multiplication:
4f = 4f

Add '-4f' to each side of the equation.
4f + -4f = 4f + -4f

Combine like terms: 4f + -4f = 0
0 = 4f + -4f

Combine like terms: 4f + -4f = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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