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= 5³a^7×3 b^6×3 c^8×3 : (5×5 a^4+3 b^3+2 c)
= 125 a^21 b^18 c^24 : 25a^7 b^5 c
= 125/25 a^21-7 b^18-5 c^24-1
= 5 a^14 b^13 c^23