$$6 \sqrt{ 7 \sqrt{ 9 \div 2 \sqrt{ x } } } 2222222$$
$6666666\sqrt{21}\times 2^{\frac{3}{4}}\sqrt[8]{x}$
$\frac{3333333\sqrt{21}\times 2^{\frac{3}{4}}}{4x^{\frac{7}{8}}}$
