To solve the equation \( 9 = 5 - \frac{y}{3} \), we can follow these steps:
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Isolate the fraction: Start by moving \( 5 \) to the left side of the equation: \[ 9 - 5 = -\frac{y}{3} \] This simplifies to: \[ 4 = -\frac{y}{3} \]
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Multiply both sides by -3 to get rid of the fraction: \[ 4 \times -3 = y \] Simplifying gives: \[ -12 = y \]
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Conclude: Thus, the solution for \( y \) is: \[ \boxed{-12} \]