Verified Answer :

so... get the like-terms and add/subtract \(7x^2-13x-2+27x^2-6x-1 \\ \quad \\ \textit{add/subtract the like-terms} \\ \quad \\ \boxed{7x^2+27x^2}\quad \boxed{-13x-6x}\quad \boxed{-1-2}\)

see what that gives you

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