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Simplify: (i) 2^(55)xx2^(60)-2^(97)xx2^(...

Simplify: (i) `2^(55)xx2^(60)-2^(97)xx2^(18)` (ii) `2^3xxa^3xx5a^4`, (iii) `(3^n+3^(n+1))/(3^(n+1)-3^n),` Where n is a natural numbers.

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