Input:
rsolve(f(x +1)=f(x) + x)
Write:
`rsolve(f(x +1)=f(x) + x)`
Output: $$ rsolve(f(1+x)=f(x)+x) == rsolve((-f(x))+f(1+x)-x,x) $$ Result: $$rsolve((-f(x))+f(1+x)-x,x)$$
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