5^9-5^8+5^7=5^7*(5^2-5+1)=5^7*(25-5+1)=5^7*21. 5^7*21 / 21=5^7.
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5^9-5^8+5^7=5^7*(5^2-5+1)=5^7*(25-5+1)=5^7*21. 5^7*21 / 21=5^7.