Simplify: `(x+3)^3+\ (x-3)^3`

Explanation

To simplify the expression \((x+3)^3 + (x-3)^3\), we can use the algebraic identities for the cubes of binomials. Here are the steps:

### Step 1: Identify A and B
Let \( A = x \) and \( B = 3 \). Thus, we can rewrite the expression as:
\[ A + B = x + 3 \quad \text{and} \quad A - B = x - 3 \]

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