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=7√4x7 - 11√7 + 2√2x7
=7x2√7 - 11√7 + 2x1√7
=14√7 - 11√7 + 2√7
=3√7 + 2√7
=5√7
7 √4 √7 - 11√7 +2 √2 √7
14 √7 - 11 √7 +2√7
(14-11+2)√7
5 √7