To simplify the expression \(6(4x + 4) + 13\), we can follow these steps:
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Distribute the \(6\) across the terms inside the parentheses: \[ 6(4x) + 6(4) = 24x + 24 \]
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Now add \(13\) to the result: \[ 24x + 24 + 13 = 24x + 37 \]
So, the expression \(6(4x + 4) + 13\) simplifies to \(24x + 37\).
Thus, the equivalent algebraic expression is:
\[ \boxed{24x + 37} \]