f(-1+1)=f(-1)+f(1)

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Solution for f(-1+1)=f(-1)+f(1) equation: 


Simplifying
f(-1 + 1) = f(-1) + f(1)

Combine like terms: -1 + 1 = 0
f(0) = f(-1) + f(1)

Reorder the terms for easier multiplication:
0f = f(-1) + f(1)

Anything times zero is zero.
0f = f(-1) + f(1)

Reorder the terms for easier multiplication:
0 = -1f + f(1)

Reorder the terms for easier multiplication:
0 = -1f + 1f

Combine like terms: -1f + 1f = 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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