Simplify:

$\sqrt { 7x } \times \sqrt { 4y } \times 2\times \sqrt { 1681z } \times \sqrt { 9x }$

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Check out the set:
2016 Problems
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$3444x\sqrt { zy }$
$492x\sqrt { 7y }$
$492x\sqrt { 7yz }$
$246x\sqrt { 7yz }$

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