Question

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Explanation:

Step1: Combine like terms for \(x^2\)

\(3x^2 + (-3x^2) = 0\)

Step2: Combine like terms for \(x\)

\(9x + (-2x) = 7x\)

Step3: Combine constant terms

\(3 + 9 = 12\)

Step4: Sum the results

\(0 + 7x + 12 = 7x + 12\)

Answer:

\(7x + 12\)