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= {(78/4) + (15/6)} ÷ 2 - 6 = [{(78 × 3 + 15 × 2) ÷ 12} ÷ 2] – 6 = {(264/12) ÷ 2} – 6 = (22 ÷ 2) – 6 = 11 – 6 = 5
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