Verified Answer :

\(\begin{array}{lrlll} x+y=-4&\times -1\implies &-x-y=4\\ x+2y=13&\implies &\ x+2y=13\\ &&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\ &&\boxed{?}+\boxed{?}=\boxed{?} \end{array}\)

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