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avatar+1439 

Let $f$ be a function such that
f(x+y) = x + f(y) + f(x) - y
for any two real numbers $x$ and $y$.  If $f(0) = -5$, then what is $f(17)?$

 Feb 17, 2024
 #1
avatar+1839 
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The answer is f(17) = -21.

 Nov 1, 2024

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