7. Simplify: 15÷ (14 + 1) - (4 9) + 6 (4 + 5)
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Answer:
15 ÷ (14 + 1) - (4 × 9) + 6 (4 + 5)
= 15 ÷ 15 - 36 + 6 × 9
= 1 - 36 + 54
= 1 - 90
= -89
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