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Input:
f(x +1)-f(x)=x
Write:
`f(x +1)-f(x)=x`
Compute:
$$fsolve((-f(x))+f(1+x)=x)$$
Output:
$$fsolve((-f(x))+f(1+x)=x)== C_1+\frac{1}{2}\ ((-x)+{x}^{2})$$
Result: $$C_1+\frac{1}{2}\ ((-x)+{x}^{2})$$
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