To solve the equation \( \frac{11}{4}x + 9 = 31 \):
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Subtract 9 from both sides: \[ \frac{11}{4}x = 31 - 9 \] \[ \frac{11}{4}x = 22 \]
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Multiply both sides by \( \frac{4}{11} \) to isolate \( x \): \[ x = 22 \cdot \frac{4}{11} \]
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Simplify: \[ x = \frac{88}{11} = 8 \]
Thus, the solution is: \[ \boxed{8} \]