72:8*7-(45:9+3*3:2

To solve the expression \( 72:8 \ast 7 - (45:9 + 3 \ast 3:2) \), I'll break it down step by step. 1. **Calculate \( 72:8 \)**: \[ 72 \div 8 = 9 \] 2. **Now calculate \( 9 \ast 7 \)**: \[ 9 \ast 7 = 63 \] 3. **Next, calculate \( 45:9 \)**: \[ 45 \div 9 = 5 \] 4. **Now, calculate \( 3 \ast 3 \)**: \[ 3 \ast 3 = 9 \] 5. **Now, calculate \( 9:2 \)**: \[ 9 \div 2 = 4.5 \] 6. **Combine the results of \( 5 \) and \( 4.5 \)**: \[ 5 + 4.5 = 9.5 \] 7. **Now, complete the expression by subtracting \( 9.5 \) from \( 63 \)**: \[ 63 - 9.5 = 53.5 \] So, the final result is: \[ \boxed{53.5} \]