To solve the inequality \( 9 < 3u - 15 \), follow these steps:
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Add 15 to both sides: \[ 9 + 15 < 3u \] \[ 24 < 3u \]
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Divide both sides by 3: \[ \frac{24}{3} < u \] \[ 8 < u \]
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Rearranging for clarity: \[ u > 8 \]
The solution to the inequality is: \[ u > 8 \]