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Add.(7f² + 5f + 9) - (5f² + 2f)

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Add:


\begin{gathered} (7f^2+5f+9)-(5f^2+2f) \\ =7f^2+5f+9-5f^2-2f \\ =7f^2-5f^2+5f-2f+9 \\ =2f^2+3f+9 \end{gathered}

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