Input: fsolve(f(x+2)-f(x+1)-f(x)=0)
Write: `fsolve(f(x+2)-f(x+1)-f(x)=0)`
Output: $$fsolve(f(x+2) - f(x+1) - f(x)=0)== C_1\ fibonacci(x)+C_2\ lucas(x)$$
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