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= 3.2√7 - 5.3√7 + 2.5√7
= 6√7 - 15√7 + 10√7
= 9√7 + 10√7
= 19√7
2√216 + 2√24 - 5√54 = 2√36.6 + 2√4.6 - 5√9.6
= 2.6√6 + 2.2√6 - 5.3√6
= 12√6 + 4√6 - 15√6
= 16√6 - 15√6
= √6