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[tex]2 \sqrt{35} \div \sqrt{5 } - 9 \sqrt{21} \div ( - 3 \sqrt{3} ) - 7 \times 2 \sqrt{7} + 8 \sqrt{42} \div \sqrt{6} = [/tex]
[tex]2 \sqrt{7} + 3 \sqrt{7} - 14 \sqrt{7} + 8 \sqrt{7} = [/tex]
[tex] - \sqrt{7} [/tex]