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2√(4x5) + √(4x7) - 3√(25x5) + 4√(9x7) - 5√(16x5)
2.2√5 + 2√7 - 3.5√5 + 4.3√7 - 5.4√5
4√5 + 2√7 - 15√5 + 12√7 - 20√5
(4 - 15 - 20)√5 + (2 + 12)√7
- 21√5 + 14√7