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= 7²x7^50 = 7^52
49 = 7^2
= 7^52x7^2 = 7^54
42 = 7x6: (7^1)(6^1)
(7^60)/(7^7) = (7^53)
= 7^54+(7^1)(6^1).[7^53]
= 7^54 + (7^54)(6^1)
= 7^54.[1 + 6]
= 7^54.[7]
= 7^55