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= 5.2√7 + 4√7 - 3.3√7
= 10√7 + 4√7 - 9√7
= 5√7
= 5.2√7 + 4√7 - 3.3√7
= 10√7 + 4√7 - 9√7
= (10+4-9)√7
= 5√7 (c)