To solve the inequality \( \frac{5z}{9} < 8 \), we will first isolate \( z \).
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Multiply both sides of the inequality by 9 to eliminate the fraction:
\[ 5z < 72 \]
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Now, divide both sides by 5:
\[ z < \frac{72}{5} \]
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Next, we convert the improper fraction \( \frac{72}{5} \) into a mixed number. Dividing \( 72 \) by \( 5 \):
\[ 72 \div 5 = 14 \quad \text{remainder} \quad 2 \]
This gives us:
\[ \frac{72}{5} = 14 \frac{2}{5} \]
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So the solution to the inequality is:
\[ z < 14 \frac{2}{5} \]
In the required format of the result, the final answer is:
\[ z < 14 \frac{2}{5} \]