Using BODMAS order: First, perform multiplication and division from left to right. 17.5 × 3 = 52.5; 21 ÷ 7 = 3; 3 × 12.5 = 37.5. Now the expression becomes 52.5 – 3 – 37.5. Performing subtraction: 52.5 – 3 = 49.5; then 49.5 – 37.5 = 12. So the answer is 12.
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