Answer: 10 + 9
Step-by-step explanation:
1. Distribute: 3(6+3) - (8-x) = 18 + 9 - (8)
2. Eliminate redundant parentheses: 18 + 9 - (8) = 18 + 9 - 1 ⋅ 8
3. Multiply the numbers: 18 + 9 - 1 ⋅ 8 = 18 + 9 - 8
4. Combine like terms: 18 + 9 - 8 = 10 + 9
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