Answer:
(7^6×2^6×5^5×3^5)÷(7^6×5^6×3^5×2^5)
7^(6-6)×2^(6-5)×5^(5-6)×3^(5-5)
7^0×2¹×5-¹×3^0
1×2×5^-1×1
2/5
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