# Implicit recursion!

Algebra Level 3

Let $$g(x)$$ the function for all real $$x$$ such that :

• $$\boldsymbol g(x)=g(x+1)+g(x-1)$$
• $$\boldsymbol g(15)=20$$
• $$\boldsymbol g(20)=15$$

Evaluate $$\boldsymbol |g(20152015)|$$

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