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