Subtract. Simplify the result if possible. \[ \frac{9 m}{m-6}-\frac{54}{m-6} \] \[ \frac{9 m}{m-6}-\frac{54}{m-6}=\square \]

Step 1 ：Subtract the two fractions since they have the same denominator: \(\frac{9 m}{m-6}-\frac{54}{m-6}\)

Step 2 ：Simplify the subtraction to get: \(9m - 54\)

Step 3 ：Final Answer: \(\boxed{9m - 54}\)