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4√2 + √40 / 16-4√20+4√20-20
4√2 + 2√10 / -4
2(2√2 + 2√10) /-4
2√2+2√10/-2
= 4√2 + √40 ÷ 16 - 4√20 + 4√20 - 20
= 4√2 + 2√10 ÷ -4
= 2 (2√2 +√10) ÷ -4