$$\frac{\sqrt{3}x}{3}=\sqrt{3}(80-x)$$
$x=60$
$$\sqrt{3}x=3\sqrt{3}\left(80-x\right)$$
$$\sqrt{3}x=240\sqrt{3}-3\sqrt{3}x$$
$$\sqrt{3}x+3\sqrt{3}x=240\sqrt{3}$$
$$4\sqrt{3}x=240\sqrt{3}$$
$$\frac{4\sqrt{3}x}{4\sqrt{3}}=\frac{240\sqrt{3}}{4\sqrt{3}}$$
$$x=\frac{240\sqrt{3}}{4\sqrt{3}}$$
$$x=60$$
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