$$\sqrt{ 2401 } = \sqrt{ \frac{ 7x }{ } }$$
$x=343$
$$49=\sqrt{\frac{7x}{1}}$$
$$49=\sqrt{7x}$$
$$\sqrt{7x}=49$$
$$7x=2401$$
$$\frac{7x}{7}=\frac{2401}{7}$$
$$x=\frac{2401}{7}$$
$$x=343$$
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